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SAT II Math I : SAT Subject Test in Math I

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

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All SAT II Math I Resources

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

Example Questions

Example Question #8 : 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

-16.4 and 12.5

5.5 and 12.4

-5.0 and 5.0

-19.0 and -9.0

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 #8 : X Intercept And Y Intercept

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

Possible Answers:

$-\frac{1}{3}$

$-\frac{1}{2}$

$\frac{1}{6}$

$\frac{1}{2}$

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 #31 : Properties Of Functions And Graphs

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 #1 : Slope

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

$\small 4x+5y=14$

Possible Answers:

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

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

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

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

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 #2 : Slope

Find the slope of the line

4x+3y=-12

Possible Answers:

$\frac{-3}{4}$

$\frac{4}{3}$

$\frac{3}{4}$

$\frac{-4}{3}$

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 #1 : 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 #4 : 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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Example Question #2 : Slope

What is the slope of the following equation? 2y = 3-7x

Possible Answers:

$-\frac{7}{2}$

$\frac{3}{2}$

Correct answer:

$-\frac{7}{2}$

Explanation:

The given equation will need to be rewritten in slope intercept format.

y=mx+b

Divide by two on both sides.

$\frac{2y }{2}=\frac{ 3-7x}{2}$

Rearrange the right side by order of powers.

$y= -\frac{7}{2}x+\frac{3}{2}$

The slope can be seen as $-\frac{7}{2}$

The answer is: $-\frac{7}{2}$

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Example Question #41 : Properties Of Functions And Graphs

What is the slope of the given equation? $y=-\frac{1}{2x}+3$

Possible Answers:

$-\frac{1}{2}$

$\textup{The slope does not exist.}$

Correct answer:

$\textup{The slope does not exist.}$

Explanation:

The slope in a linear equation is defined as y=mx+b .

The x-variable exists in the denominator, which refers to the parent function of:

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

This function is not linear, and will have changing slope along its domain.

The answer is: $\textup{The slope does not exist.}$

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Example Question #1 : Maximum And Minimum

What is the vertex of the following function? Is it a maximum or a minimum?

$\small f(x) = -3(x-2)^2+9$

Possible Answers:

$\small \small (2,9); maximum$

$\small (2,-9); maximum$

$\small (2,9); minimum$

$\small (-2,9); maximum$

$\small (-2,9); minimum$

Correct answer:

$\small \small (2,9); maximum$

Explanation:

The equation of a parabola can be written in vertex form

$\small f(x) = a(x-h)^2+k$

where $\small \tiny (h,k)$ is the vertex and $\tiny a$ determines if it is a minimum or maximum. If $\tiny a$ is positive, then it is a minimum; if $\tiny a$ is negative, then it is a maximum.

$\small \small f(x)=-3(x-2)^2+9$

In this example, $\small \small a$ is negative, so the vertex is a maximum.

$\small h = 2$ and $\small k=9$

$\small (h,k)=(2,9)$

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SAT II Math I : SAT Subject Test in Math I

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

All SAT II Math I Resources

Example Questions

Example Question #8 : X Intercept And Y Intercept

Example Question #8 : X Intercept And Y Intercept

Example Question #31 : Properties Of Functions And Graphs

Example Question #1 : Slope

Example Question #2 : Slope

Example Question #1 : Slope

Example Question #4 : Slope

Example Question #2 : Slope

Example Question #41 : Properties Of Functions And Graphs

Example Question #1 : Maximum And Minimum

All SAT II Math I Resources

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