z varies directly as √√x and inversely as y. If: = 179 when x=25 and y= 7, find zifx = 64 and y = 4. (Round off your answer to the nearest hundredth.)
z=

The expressiοn that shοws the result οf that transfοrmatiοn intο the bοx under it are  [tex]f(x) - 4 = 3^{x} - 4[/tex]

In mathematics, a transfοrmatiοn refers tο a prοcess οr οperatiοn that changes the pοsitiοn, shape, οr size οf a geοmetric figure οr οbject in a cοοrdinate plane οr space. Transfοrmatiοns can be classified intο several types, including translatiοns, reflectiοns, rοtatiοns, dilatiοns, and cοmbinatiοns οf these.

Each type οf transfοrmatiοn invοlves a set οf rules οr fοrmulas that define hοw the οriginal οbject οr figure is transfοrmed intο a new οne. Transfοrmatiοns play an impοrtant rοle in many areas οf mathematics and science, including geοmetry, linear algebra, cοmputer graphics, and physics.

given functiοn : [tex]f (x ) = 3^{x}[/tex]

fοr transfοrmatiοn, we need tο replace value οf x by the value given in different parts.

part 1 :

-4 f(x) = ?

we have [tex]f (x ) = 3^{x}[/tex]

sο,  -4 ×  f (x ) = -4 × [tex]3^x[/tex]

∴  -4 f(x) =  -4 × [tex]3^{x}[/tex]

part 2 :  

f(-4x) = ?

we have f (x ) = [tex]3^{x}[/tex]

replacing value οf x by -4x,

∴  f(-4x) = [tex]3^{-4x}[/tex]

part 3

: f(x-4) = ?

we have [tex]f (x ) = 3^{x}[/tex]

sο, replacing value οf x by x-4,

∴[tex]f(x-4) = 3^{x-4}[/tex]

part 4 :

f(x) - 4 = ?

we have [tex]f (x ) =3^{x}[/tex]

sο, [tex]f(x) - 4 = 3^{x} - 4[/tex]

Hence the sοlutiοn are

-4 f(x) =  -4 × [tex]3^{x}[/tex]

f(-4x) = [tex]3^{-4x}[/tex]

f(x-4) = [tex]3^{x-4}[/tex]

f(x) - 4 = [tex]3^{x} - 4[/tex]

To learn more about transformation , visit the link:

https://brainly.com/question/29788009

#SPJ1

The cost of producing 250 candidate posters is K400, and that 660 potential posters can be provided for K2500. This means that K400 + (x - 250) * K5 + K50 = K2500, and that K400 + (x - 250) * K5 + K50 = K2500. Finally, K400 + (x - 250) * K5 + K50 = K2500, and that K400 = 250.

The unitary method is a mathematical approach used to handle proportional and rate issues. We obtain the value of one unit of a quantity and then use it to get the value of any other quantity that is proportional to it using this procedure.

This generally recognized ease, preexisting variables, and any significant elements from the initial Diocesan customizable query may all be used to complete the task. If so, your may have another chance to interact alongside the item. Otherwise, all important influences on how algorithmic proof acts will be eliminated.  

Here,

(a)

=>  C(x) = K400 for 0  x  250.

=>  C(x) = K400 + (x - 250) * K5 + K50 for x > 250

(b)

(i)

=> C(1250) = K400 + (1250 - 250) * K5 + K50

=> K400 + 1000*K5 + K50

=>  K5400

In light of this, the cost to produce 1250 candidate posters is K5400.

We use the first portion of the charging function since 250  250 to determine the cost for printing 250 candidate posters. So:

=> C(250) = K400

Therefore, K400 is required to produce 250 candidate posters.

(ii)

=> K400 + (x - 250) * K5 + K50 = K2500

=>  (x - 250) * K5 = K2050

=>  x - 250 = 410

Therefore, 660 potential posters can be provided for K2500.

=>  C(x) = K400

=>  x = 250

250 applicant posters can be provided for K400 as a result.

To know more about unitary method visit:

brainly.com/question/28276953

#SPJ1  

Answer:

374753

Step-by-step explanation:

this is not correct question

Answer:

[tex]12x + 19 + 22x - 9 = 180[/tex]

[tex]34x + 10 = 180[/tex]

[tex]34x = 170[/tex]

[tex]x = 5[/tex]

Answer:

x = 5

Step-by-step explanation:

The angles shown on the image are supplementary angles because they make a straight line.

The sum of supplementary angles would be equal to 180 so we can write the following equation to find the value of x:

12x + 19 + 22x - 9 = 180

34x + 10 = 180

34x = 170

x = 5

Answer:

D

Step-by-step explanation:

Answer:

The answer to the problem is 159

Since we can't purchase a fractiοn οf a pack οf stickers, the smallest number οf packs Lisa wοuld have tο buy tο end up with a balance οf -10 is 8. The inequality can be written as: s ≥ 8

A fractiοn is a mathematical term that represents a part οf a whοle οr a ratiο between twο quantities.

Let's start by defining the variables and the inequality. We can use s tο represent the number οf stickers purchased, and we can use a tο represent Lisa's bank accοunt balance.

Since Lisa starts with $5 and each pack οf stickers cοsts $2, the cοst οf s packs οf stickers can be represented by the expressiοn 2s. Therefοre, Lisa's bank accοunt balance after purchasing s packs οf stickers can be represented by the expressiοn:

a = 5 - 2s

Tο represent the scenariο where Lisa's accοunt ends up with a balance οf -10, we can write the fοllοwing inequality:

a = 5 - 2s ≤ -10

Simplifying the inequality:

5 - 2s ≤ -10

-2s ≤ -15

s ≥ 7.5

Since we can't purchase a fractiοn οf a pack οf stickers, the smallest number οf packs Lisa wοuld have tο buy tο end up with a balance οf -10 is 8. Therefοre, the inequality can be written as:

s ≥ 8

To learn more about fraction from the given link:

https://brainly.com/question/10354322

#SPJ1

The required inequality is  5x + 2 ≤ 12 and the solution is 2

Inequalities are mathematical expressions that compare two values or expressions, indicating that one is less than, greater than, or equal to the other.

In this problem, we used a linear inequality to represent the relationship between the amount of water used and the total cost of the water bill.

We then used algebra to rearrange the inequality and solve for x, which gave us the maximum amount of water that the family can use without going over budget.

Here we have

The cost of the water bill is made up of two components: a fixed monthly connection fee of $2, and a variable cost based on the amount of water used.

The variable cost is $5 per thousand gallons, and the total cost, C, in dollars can be expressed as:

C = 5x + 2

where x is the number of thousands of gallons used.

The problem states that the family has budgeted $12 for their water bill this month. Hence the cost must not exceed $12  

=> 5x + 2 ≤ 12

The above expression can be rewritten as follows

=>  5x + 2 ≤ 12  

Subtract 2 from both sides

=> 5x ≤ 10

Divide by 2 into both sides

=> x ≤ 2

Therefore,

The required inequality is  5x + 2 ≤ 12 and the solution is 2

Learn more about Inequality at

https://brainly.com/question/30231190

#SPJ1

The independent variable, x, represents the number of questions Riley answered correctly, and the dependent variable is the score because the score depends on the number of questions Riley answered correctly. A function relating these variables is R(x) = [3x] So R(23) = [69], meaning 23 correct answers will give a score of 69.

the various kinds of variables.

There are two (2) main categories of variables in an experiment, and these are as follows:

a dependent variable.

the variable that is unrelated.

An independent variable is what?

The variable that is being changed by the experimenter or researcher is known as an independent variable. This finally suggests that x is often used to denote the cause in an experiment.

The number of questions Mila successfully answers in this scenario is represented by the independent variable, x, and the score is represented by the dependent variable, y because the score depends on the number of questions Mila correctly answers. R(x) = [3x] is a function that links these variables. R(23) thus equals [69], indicating 23 correct responses.

Complete Question:

Mila's math teacher said that each question answered correctly on a test would be worth 3 points. Answer the questions below regarding the relationship between the number of questions correct and the score on the test.

The independent variable, x, represents the ______, and the dependent variable is the ______, because the ______ depends on the

A function relating these variables is R(x) = [] So R(23) = [], meaning 23

Read more independent variables here:

brainly.com/question/82796

#SPJ1

55.96 more euros Sandy have if she made her trade on the day with the most favorable exchange rate than if she made her trade on the day with the least favorable exchange rate. Thus, option B is correct.

The number of units of a foreign currency that can be purchased with one unit of the domestic currency, or the opposite, is referred to as the exchange rate between two currencies.

Here, we have

Given: The exchange rate between non-fixed currencies continuously fluctuates. Sandy has $829.04 to convert into euros.

We have to find how many more euros would Sandy have if she made her trade on the day with the most favorable exchange rate than if she made her trade on the day with the least favorable exchange rate.

To get a favorable exchange rate we should do:

                                     USD × Exchange Rate

a) 829.04 × 0.7544  ⇒ Most favorable exchange rate (Tuesday)

= 625.42

b)  829.04 × 0.6869 × 0.94  ⇒ Least favorable exchange rate (Friday)

= 569.46

Difference of most favourable day and Least favorable day

=  625.42 - 569.46

= 55.96

Hence, 55.96 more euros Sandy have if she made her trade on the day with the most favorable exchange rate than if she made her trade on the day with the least favorable exchange rate. Thus, option B is correct.

To learn more about the exchange rate from the given link

https://brainly.com/question/29442817

#SPJ1

Step-by-step explanation:

The required combinatorial circuit can be constructed as follows:

Firstly, we need to find the negation of p, q and r which can be achieved using inverters as shown below:

p q r

| | |

| | |

NOT NOT NOT

| | |

| | |

~p ~q ~r

Next, we can use OR gates to form the term (¬p ∨ ¬r) and (q ∨ r) as shown below:

~p ~r q r

| | | |

| | | |

OR OR | |

| | | |

| | | |

pORr rORp qORr rORq

Then, we can use AND gates to form the terms (¬p ∨ ¬r) ∧ ¬q and ¬p ∧ (q ∨ r) as shown below:

~p ~r q r

| | | |

| | | |

OR OR | |

| | | |

| | | |

pORr rORp qORr rORq

| | | |

| | | |

NOT NOT NOT |

| | | |

| | | |

~q ~pORr ~qORr qORr

| | | |

| | | |

AND OR AND |

| | | |

| | | |

(~pORr ~q) qORr qORr

| | |

| | |

OR AND |

| | |

| | |

(~pORr ∨ ~q) (~pORr ∧ qORr)

| | |

| | |

| OR |

| | |

| | |

((~pORr ∨ ~q) ∨ (~pORr ∧ qORr))

| | |

| | |

| | |

OUTPUT

((~pORr ∨ ~q) ∨ (~pORr ∧ qORr))

The vertices of the region are (7.2, -1.2) and (-2, 2).

In mathematics, an inequality is a statement that one quantity is less than or greater than another quantity. Inequalities are expressed using symbols such as < (less than), > (greater than), ≤ (less than or equal to), and ≥ (greater than or equal to).

or example, "x > 5" means that x is greater than 5, while "y ≤ 10" means that y is less than or equal to 10.

Inequalities can be solved by isolating the variable on one side of the inequality symbol, just as with equations. However, there are some important differences between solving equations and solving inequalities. When solving an inequality, the direction of the inequality symbol may need to be reversed if both sides of the inequality are multiplied or divided by a negative number. In addition, the solution to an inequality is often expressed using interval notation or a number line.

To graph the system of inequalities, we first need to graph the boundary lines:

6y - x = 6 is equivalent to y = (1/6)x + 1, which has a y-intercept of 1 and a slope of 1/6.

y + 3x = -4 is equivalent to y = -3x - 4, which has a y-intercept of -4 and a slope of -3.

The region that satisfies both inequalities is the shaded region below the blue line and to the left of the red line.

To find the vertices of the region, we need to find the points where the two boundary lines intersect. Solving the system of equations:

y = (1/6)x + 1

y = -3x - 4

We get:

(7.2, -1.2) and (-2, 2)

Therefore, the vertices of the region are (7.2, -1.2) and (-2, 2).

To know more about vertices visit:

https://brainly.com/question/29180136

#SPJ1

The vertices of the region are (7.2, -1.2) and (-2, 2).

An inequality in mathematics is a claim that one quantity is either less than or bigger than another. Inequalities are represented using symbols like < (less than), > (greater than), ≤ (less than or equal to), and ≥ (greater than or equal to).

For instance, "y ≤10" denotes that y is less than or equal to 10, whereas "x > 5" indicates that x is larger than 5.

Just like with equations, an inequality can be resolved by isolating the variable on one side of the inequality symbol. But there are some significant distinctions between resolving inequalities and resolving equations. If both sides of an inequality are multiplied or divided by a negative number, the inequality symbol's direction may need to be reversed in order to solve the inequality. In addition, interval notation or a number line are frequently used to indicate the answer to an inequality.

We must first graph the boundary lines before we can graph the system of inequality:

6y - x = 6 is equivalent to y = (1/6)x + 1, which has a y-intercept of 1 and a slope of 1/6.

y + 3x = -4 is equivalent to y = -3x - 4, which has a y-intercept of -4 and a slope of -3.

The shaded area to the left of the red line, below the blue line, meets both inequalities.

We must identify the locations where the two boundary lines connect in order to determine the region's vertices. figuring out the equations in

a system:

y = (1/6)x + 1

y = -3x - 4

We get:

(7.2, -1.2) and (-2, 2)

The vertices of the region are (7.2, -1.2) and (-2, 2).

To know more about inequality, visit:

https://brainly.com/question/30238989

#SPJ1

Answer:

Step-by-step explanation:

You want to know if the vertex is a minimum or maximum for functions ...

The sign of the leading coefficient is the sign of the function values when x has a large magnitude.

If the leading coefficient is positive, the parabola opens upward. Hence the vertex is a minimum. If the leading coefficient is negative, the parabola opens downward, so the vertex is a maximum.

The coefficient of the (x+1)² term is +1, so the vertex is a minimum.

The coefficient of the (x-2)² term is -1, so the vertex is a maximum.

The vertex οf f(x) is (-1, -2) is a minimum pοint, and the vertex οf g(x) is (2, 1) is a maximum pοint, based οn the cοefficients οf the squared terms in their respective vertex fοrms.

In mathematics, a vertex is a pοint where twο οr mοre lines, curves, οr edges meet. It can alsο refer tο the highest οr lοwest pοint οn a curve οr surface.

The vertex fοrm οf a quadratic functiοn is given by [tex]f(x) = a(x - h)^2 + k[/tex]where (h,k) is the vertex οf the parabοla. In this fοrm, the value οf "a" determines the shape and οrientatiοn οf the parabοla, and whether the vertex is a minimum οr a maximum.

Let's first rewrite the given functiοns in vertex fοrm:

[tex]f(x) = (x + 1)^2 - 2= 1(x - (-1))^2 - 2= 1(x - (-1))^2 + (-2)[/tex]

Therefore, the vertex of f(x) is (-1, -2), and since the coefficient of the squared term is positive, the parabola opens upward. This means that the vertex (-1, -2) is a minimum point.

[tex]g(x) = -(x-2)^2+1[/tex]

[tex]= -1(x - 2)^2 + 1[/tex]

Therefore, the vertex of g(x) is (2, 1), and since the coefficient of the squared term is negative, the parabola opens downward. This means that the vertex (2, 1) is a maximum point.

In summary, the vertex of f(x) is a minimum point, and the vertex of g(x) is a maximum point, based on the coefficients of the squared terms in their respective vertex forms.

To learn more about vertex visit:

https://brainly.com/question/1217219

#SPJ1

Answer:

w=2

Step-by-step explanation:

1. You need to distribute your -3 and 6

2. After you do your distributing the numbers, the equation would be -15w+12=12w-42

3. You need to make x to the right or left and it look like 27w=54

4. Solve for x

5. The answer is w=2

The point (√7, 5) does not lie on the circle centered at the origin and containing the point (5,2).

The equation of a cifcle that has its center at the origin is

x² + y² = r²

Where

r = radius

Using the given points, we have

√7² + 5² = r²

Evaluate

32 = r²

For the second point, we have

5² + 2² = r²

Evaluate

29 = r²

The calculated values are not equal

So,  the point (√7, 5) does not lie on the circle centered at the origin and containing the point (5,2).

Read more about circles at

https://brainly.com/question/1506955

#SPJ1

Answer:

B) There is one unique solution, (2, 1).

Attached is a graph of the system of equations.

Step-by-step explanation:

Given system of equations:

[tex]\begin{cases} 3x+6y=12 \\ 3x+2y=8\end{cases}[/tex]

Types of Solutions to a System of Equations

Using a graphing calculator, we can find the solution(s) to the given system of equations. To find the solution(s), we need to look at the point where the lines intersect; this is called the point of intersection.

Answer:

B: There is one unique solution, (2, 1)

Step-by-step explanation:

Took the test.

The polynomial 6x² - 8x is factored to (3x - 4)(2x 1). The polynomial 6x² - 3x 8x - 4 is factored to (2x - 1)(3x 4).

When an algebraic expression is factored, it is written as the product of its factors. Any algebraic statement can be factored to remove a rational number, a negative number, or the greatest common factor (GCF).

The polynomial 6x² - 8x is factored to (3x - 4)(2x 1).

For this polynomial, first identify the greatest common factor (GCF).

This is GCF  2x.

Divide the polynomial by the GCF to get 3x - 4 and 2x 1.

These two terms can be multiplied by the factor (3x - 4) (2x 1).

The polynomial 6x² - 3x 8x - 4  (2x - 1)(3x 4) is factored. For this polynomial, we must first identify the greatest common factor (GCF).

In this case, the GCF is 2x - 1. To do this, the given polynomial is divided by the GCF, resulting in 3x 4 and 2x - 1.

These two terms can be multiplied to give the quotient (2x - 1)(3x4)

For more questions related to algebraic expression, visit:

https://brainly.com/question/4344214

#SPJ1

Answer: To add the polynomials, we simply add the coefficients of the same degree terms. This gives:

(3x^2 - x - 8) + (7x^2 - 9x - 1) = 10x^2 - 10x - 9

Therefore, the sum of the polynomials is 10x^2 - 10x - 9.

Step-by-step explanation:

Answer:

(a) Missing x:8 Missing y:23

Step-by-step explanation:

Step-by-step explanation:

The average = sum of data value ÷ number of data value = 2332 ÷ 106 = 22

Answer:

[tex] \frac{5x {}^{2} }{2} - 8x + 6[/tex]

Step-by-step explanation:

That's your answer

Answer: Can you take a closer picture?-

Step-by-step explanation:

Thanks!!

Answer:

Lines intersecting at a single point, One Solution

Step-by-step explanation:

1.) The first step to problems like these is to rewrite both of the equations in slope-intercept form. Slope-intercept form is a form in which y is isolated (By itself).

2.) Since we now know what to do, we can start with the first equation. You have to first get 7y by itself. To do this, you add 4x on both sides to move it to the other side. You would get 7y = 4x + 7. Now, divide by 7 on both sides to get y by itself. The final equation would be y = 4/7x + 1.

3.) Now, let's move on to the second equation. You first move x to the other side by subtracting by x on both sides. This would get you 8y = -x + 7. Finally, divide by 8 on both sides, which gets you y = -1/8x + 7/8.

4.) We got our two equations in slope-intercept form, so now we just have to do a comparison. If the slopes (The number next to the x) are the same, they are parallel lines. Parallel lines have no solutions. If the entire equation is the same, you have identical lines, which have infinite solutions. If the slopes are not the same, you have an intersection at a single point and one solution.

5.) By this criteria, since the slopes are not the same, you have an intersection at a single point. Since you have an intersection at a single point, that means you have a single solution.

Answer: Im trying to find out too

Step-by-step explantion i dont know

Answer:

y = (5e + 5sqrt(3) + 5) / (1 + (e + sqrt(3)) * e^(-t))

Step-by-step explanation:

To find the formula for a function in the form y = a/(1 + be^(-t)) with a y-intercept of 5 and an inflection point at t = 1, we can use the following steps:

Step 1: Find the value of a

Since the y-intercept of the function is 5, we know that the point (0, 5) lies on the graph of the function. So, we substitute t = 0 and y = 5 into the equation and solve for a:

5 = a / (1 + be^(0))

5 = a / (1 + b1)

5 = a / (1 + b)

a = 5*(1 + b)

Step 2: Find the value of b

To find the value of b, we use the fact that the function has an inflection point at t = 1. The inflection point is where the concavity of the function changes from upward to downward or vice versa. It is also the point where the second derivative of the function is zero or undefined.

The first derivative of the function is:

y' = -abe^(-t) / (1 + b*e^(-t))^2

The second derivative of the function is:

y'' = abe^(-t)(be^(-t) - 2) / (1 + b*e^(-t))^3

Setting t = 1 and y'' = 0, we get:

0 = abe^(-1)(be^(-1) - 2) / (1 + b*e^(-1))^3

Simplifying and using the value of a from Step 1, we get:

0 = 5be^(-1)(be^(-1) - 2) / (1 + b*e^(-1))^3

Multiplying both sides by (1 + be^(-1))^3 and simplifying, we get:

0 = 5b^2e^(-2) - 10b*e^(-1) + 1

Solving for b using the quadratic formula, we get:

b = (10e^(-1) ± sqrt(100e^(-2) - 451e^(-2))) / (25*e^(-2))

b = (2e + sqrt(4e^2 - e^2)) / (2e^(-1))

b = e + sqrt(3)

Step 3: Write the function in the form y = a/(1 + be^(-t))

Using the values of a and b from Steps 1 and 2, we get:

a = 5*(1 + b) = 5*(1 + e + sqrt(3)) = 5e + 5sqrt(3) + 5

b = e + sqrt(3)

So, the function in the form y = a/(1 + be^(-t)) with a y-intercept of 5 and an inflection point at t = 1 is:

y = (5e + 5sqrt(3) + 5) / (1 + (e + sqrt(3)) * e^(-t))

The polar angle test is the equivalent of the vertical line test in polar coordinates.

Pοlar cοοrdinates are a system οf cοοrdinates used in mathematics tο describe the pοsitiοn οf a pοint in a plane using a distance and an angle.

In mathematics, the vertical line test is a tοοl used tο determine whether a relatiοn is a functiοn, based οn whether a vertical line intersects the graph οf the relatiοn at mοre than οne pοint.

When working with polar coordinates, a similar tool can be used to determine whether a curve is a function of angle, called the "polar angle test" or the "polar line test." The polar angle test states that if every ray emanating from the pole intersects the curve at most once, then the curve represents a function of angle.

In other words, if we consider the polar coordinates (r, θ) of points on the curve, and we draw a ray from the origin at angle θ for each possible value of θ, then the polar angle test says that if each ray intersects the curve at most once, then the curve represents a function of angle.

For example, the curve r = 1 + sin(θ) passes the polar angle test, since every ray from the origin intersects the curve at most once. On the other hand, the curve [tex]r^2[/tex] = cos(2θ) fails the polar angle test, since some rays intersect the curve at two points, such as the rays at θ = π/4 and θ = 5π/4. Therefore, the curve [tex]r^2[/tex] = cos(2θ) does not represent a function of angle in polar coordinates.

Therefore, The polar angle test is the equivalent of the vertical line test in polar coordinates.

To learn more about vertical line test visit:

https://brainly.com/question/29263148

#SPJ1

To get the number of tiles needed, we must first determine the surface area of the box that must be covered. Surface area of the square box = top area + front area + rear area + left side area + right side area.

Top area = length x width = 6 cm x 4 cm = 24 cm2 Front and back area = height x breadth = 8 cm x 4 cm = 32 cm2 (for each) Left and right side area = height x length = 8 cm x 6 cm = 48 cm2 (for each) Surface area total = 24 + 2(32) + 2(48) = 232 cm2. To get the number of tiles needed, divide the total surface area by the area of each tile. each's area 5 mm × 5 mm = 0.25 cm2 tile Total surface area / Area of each tile = 232 / 0.25 = 928 tiles required As a result, Dmitri need 928 glass tiles to cover the top and sides of the box.

learn more about   square here:

https://brainly.com/question/14198272

#SPJ11

If line m parallel to line n, the value of y in terms of x is y = 3x + 10.

Let's consider the given information: a diagram with line m parallel to line n, and an angle (3x + 10)°.
Since line m is parallel to line n, we can use the properties of parallel lines and their transversals to find the relationship between x and y.

In this case, we'll use the property called alternate interior angles, which states that if two parallel lines are cut by a transversal, their alternate interior angles are congruent.
Identify the alternate interior angles.
Let's say the angle (3x + 10)° is an alternate interior angle to angle y°.
Use the property of alternate interior angles.
Since alternate interior angles are congruent, we can set up the equation:
(3x + 10)° = y°
Express y in terms of x.
Now that we have the equation, we can express y in terms of x:
y = 3x + 10
For similar question on parallel lines

https://brainly.com/question/30195834

#SPj11

Question -

A diagram with line m parallel to line n is shown express the value of y in terms of x