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SAT II Math I : Functions and Graphs

Study concepts, example questions & explanations for SAT II Math I

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6 Diagnostic Tests 113 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

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Example Question #2 : X Intercept And Y Intercept

Find the -intercepts of the following equation:

y^2+x+5y=3x^2-2

Round each of your answers to the nearest tenth.

Possible Answers:

-4.6 and -0.4

-4.4 and 1.7

-5.2 and -3.1

5.2 and 8.9

1.5 and 2.4

Correct answer:

-4.6 and -0.4

Explanation:

For an equation like this, you should use the quadratic formula to solve for the roots. We can easily get our equation into proper form by substituting for . Then, we need to get it into standard form:

y^2+0+5y=3(0)^2-2

y^2+5y=-2

y^2+5y+2=0

Recall that the general form of the quadratic formula is:

$\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

Based on our equations, the following are your formula values:

a = 1

b = 5

c=2

Therefore, the quadratic formula will be:

$\frac{-5\pm\sqrt{5^2-4(1)(2)}}{2(2)}$

Simplifying, you get:

$\frac{-5\pm\sqrt{25-8}}{4}$

$\frac{-5\pm\sqrt{17}}{4}$

Using a calculator, you will get:

-4.561552812808831 and -0.43844718719117

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Example Question #1 : X Intercept And Y Intercept

What is the -intercept of the following equation?

44x-2y=120+4x

Possible Answers:

None of the others

Correct answer:

Explanation:

The easiest way to solve for this kind of simple -intercept is to set equal to . You can then solve for the value in order to find the relevant intercept.

44x-2(0)=120+4x

44x=120+4x

Solve for :

40x = 120

Divide both sides by 40:

x = 3

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Example Question #8 : X Intercept And Y Intercept

y=15x-30

What is the x-intercept of the above equation?

Possible Answers:

Correct answer:

Explanation:

To find the x-intercept, you must plug in for .

This gives you,

0=15x-30 and you must solve for .

First, add to both sides which gives you,

30=15x .

Then divide both sides by to get,

x=2 .

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Example Question #9 : X Intercept And Y Intercept

Find the -intercepts of the following equation:

x^2+(y+14)^2 = 25

Round each of your answers to the nearest tenth.

Possible Answers:

11.0 and 36.0

-19.0 and -9.0

-16.4 and 12.5

-5.0 and 5.0

5.5 and 12.4

Correct answer:

-19.0 and -9.0

Explanation:

There are two ways to solve this. First, you could substitute in for :

0^2+(y+14)^2 = 25

Take the square-root of both sides and get:

$y+14 = \pm5$

$y= -14\pm5$

Therefore, your two answers are and .

You also could have done this by noticing that the problem is a circle of radius , shifted downward by .

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Example Question #31 : Functions And Graphs

What is the x-intercept of the given equation? 2x+3y = 1

Possible Answers:

$\frac{1}{6}$

$-\frac{1}{2}$

$-\frac{1}{3}$

$\frac{1}{2}$

Correct answer:

$\frac{1}{2}$

Explanation:

In order to determine the x-intercept, we will need to let y=0 , and solve for .

2x+3(0) = 1

2x=1

Divide both sides by two.

$\frac{2x}{2}=\frac{1}{2}$

The answer is: $\frac{1}{2}$

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Example Question #11 : X Intercept And Y Intercept

What is the y-intercept of the function? $y=\frac{2}{x-1}+\frac{3}{x+1}$

Possible Answers:

$\frac{1}{5}$

$\textup{Does not exist.}$

Correct answer:

Explanation:

The y-intercept is the value of when x=0 .

Substitute zero into the x-variable in the equation.

$y=\frac{2}{0-1}+\frac{3}{0+1} = -2+3 = 1$

The y-intercept is .

The answer is:

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Example Question #26 : How To Find Slope Of A Line

What is the slope of the line depicted by this equation?

$\small 4x+5y=14$

Possible Answers:

$\small -\frac{4}{5}$

$\small \frac{14}{5}$

$\small \frac{4}{5}$

$\small \frac{5}{4}$

Correct answer:

$\small -\frac{4}{5}$

Explanation:

This equation is written in standard form, that is, $\small Ax+By=C$ where the slope is equal to $\small \frac{-A}{B}$ .

$\small 4x+5y=14$

In this instance $\small A=4$ and $\small B=5$

$m=-\frac{A}{B}=-\frac{4}{5}$

This question can also be solved by converting the slope-intercept form: $\small y=-\frac{4}{5}x+\frac{14}{5}$ .

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Example Question #1 : Slope

Find the slope of the line

4x+3y=-12

Possible Answers:

$\frac{-3}{4}$

$\frac{3}{4}$

$\frac{4}{3}$

$\frac{-4}{3}$

Correct answer:

$\frac{-4}{3}$

Explanation:

To find the slope of any line, we must get the equation into the form

y=mx+b

where m is the slope and b is the y-intercept.

To manipulate our equation into this form, we must solve for y. First, we must move the x term to the right side of our equation by subtracting it from both sides.

(4x+3y)-4x = (-12)-4x

3y = -4x-12

To isolate y, we now must divide each side by 3.

$\frac{3y}{3}=\frac{-4x}{3}-\frac{12}{3}$

$y=\frac{-4}{3}x-4$

Now our equation is in the desired form. The coefficient of our x term is our slope, . Therefore

$m = \frac{-4}{3}$

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Example Question #2 : Slope

$\frac{y}{2}=5x-1$

What is the slope of the function above?

Possible Answers:

Correct answer:

Explanation:

First you must get the formula into slope-intercept form which means having by itself,

y=mx+b where is the slope.

You must multiple both sides by to get,

y=10x-2 .

The slope is the value being multiplied by the variable, so our slope is .

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Example Question #1 : Slope

Find the slope of the following equation: 3x+3y =1

Possible Answers:

$-\frac{1}{3}$

$\frac{1}{3}$

Correct answer:

Explanation:

In order to find the slope, we will need to rearrange the equation so that it is in slope-intercept form y=mx+b .

Subtract on both sides.

3x+3y -3x=1-3x

3y=-3x+1

Divide by three on both sides.

$\frac{3y}{3}=\frac{-3x+1}{3}$

$y=-x + \frac{1}{3}$

This equation is now in the form of y=mx+b , where is the slope.

The slope is .

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SAT II Math I : Functions and Graphs

Study concepts, example questions & explanations for SAT II Math I

All SAT II Math I Resources

Example Questions

Example Question #2 : X Intercept And Y Intercept

Example Question #1 : X Intercept And Y Intercept

Example Question #8 : X Intercept And Y Intercept

Example Question #9 : X Intercept And Y Intercept

Example Question #31 : Functions And Graphs

Example Question #11 : X Intercept And Y Intercept

Example Question #26 : How To Find Slope Of A Line

Example Question #1 : Slope

Example Question #2 : Slope

Example Question #1 : Slope

All SAT II Math I Resources

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