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SSAT Upper Level Math : SSAT Upper Level Quantitative (Math)

Study concepts, example questions & explanations for SSAT Upper Level Math

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All SSAT Upper Level Math Resources

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Example Questions

Example Question #1 : How To Find Whether Lines Are Parallel

Parallel

Figure NOT drawn to scale

In the above figure, m ||n . Express in terms of .

Possible Answers:

y = 48-x

y = 138 - x

y = x+42

y = x-14

Correct answer:

y = x-14

Explanation:

The two marked angles are corresponding angles of two parallel lines formed by a transversal, so the angles are congruent. Therefore,

y+28 = x+ 14

Solving for by subtracting 28 from both sides:

y+28 - 28 = x+ 14 - 28

y = x-14

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Example Question #4 : How To Find Whether Lines Are Parallel

Parallel

Figure NOT drawn to scale

In the above figure, m ||n . Evaluate .

Possible Answers:

x = 106

x = 111

x = 101

x= 96

Correct answer:

x = 101

Explanation:

The two marked angles are same-side exterior angles of two parallel lines formed by a transversal ,; by the Parallel Postulate, the angles are supplementary - the sum of their measures is 180 degrees. Therefore,

(x+12) + (x- 34) = 180

2x -22 = 180

2x = 202

x = 101

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Example Question #651 : Ssat Upper Level Quantitative (Math)

Three lines are drawn on the coordinate plane.

The green line has slope $\frac{2}{3}$ , and -intercept $\frac{4}{5}$ .

The blue line has slope $\frac{3}{2}$ , and -intercept $-\frac{5}{4}$ .

The red line has slope $-\frac{2}{3}$ , and -intercept $-\frac{4}{5}$ .

Which two lines are perpendicular to each other?

Possible Answers:

It cannot be determined from the information given.

No two of these lines are perpendicular.

The blue line and the green line are perpendicular.

The green line and the red line are perpendicular.

The blue line and the red line are perpendicular.

Correct answer:

The blue line and the red line are perpendicular.

Explanation:

To demonstrate two perpendicular lines, multiply their slopes; if their product is , then the lines are perpendicular (the -intercepts are irrelevant).

The products of these lines are given here.

Blue and green lines: $\frac{2}{3} * \frac{3}{2} = 1$

Red and green lines: $\frac{2}{3} * \left - \frac{2}{3} \right = -\frac{4}{9}$

Blue and red lines: $\frac{2}{3}* \left - \frac{3}{2} \right = -1$

It is the blue and red lines that are perpendicular.

We can also see that their slopes are negative reciprocals, indicating perpendicular lines.

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Example Question #652 : Ssat Upper Level Quantitative (Math)

Two perpendicular lines intersect at point (3,8) . One line also includes point (4,-1) . What is the slope of the other line?

Possible Answers:

Insufficient information is given to answer the question.

$-\frac{1}{9}$

$\frac{1}{9}$

Correct answer:

$\frac{1}{9}$

Explanation:

The slopes of two perpendicular lines are the opposites of each other's reciprocals.

To find the slope of the first line substitute $x_{1} = 3, y_{1} =8, x_{2} = 4, y_{2} =-1$ in the slope formula:

$m =\frac{ y_{1}-y_{2}}{ x_{1}-x_{2}}$

$m =\frac{ 8 - (-1)}{ 3-4} = \frac{ 9}{ -1} = -9$

The slope of the first line is , so the slope of the second line is the opposite reciprocal of this, which is $\frac{1}{9}$ .

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Example Question #653 : Ssat Upper Level Quantitative (Math)

Two perpendicular lines intersect at the origin; one line also passes through point (5,7) . What is the slope of the other line?

Possible Answers:

$\frac{ 7}{5}$

Insufficient information is given to solve the problem.

$-\frac{5}{ 7}$

$-\frac{ 7}{5}$

$\frac{5}{ 7}$

Correct answer:

$-\frac{5}{ 7}$

Explanation:

The slopes of two perpendicular lines are the opposites of each other's reciprocals.

To find the slope of the first line, substitute $x_{1} = 5, y_{1} =7, x_{2} = 0, y_{2} =0$ in the slope formula:

$m =\frac{ y_{1}-y_{2}}{ x_{1}-x_{2}}$

$m =\frac{ 7-0}{5-0}=\frac{ 7}{5}$

The slope of the first line is $\frac{ 7}{5}$ , so the slope of the second line is the opposite reciprocal of this, which is $-\frac{5}{ 7}$ .

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Example Question #654 : Ssat Upper Level Quantitative (Math)

Which of the following lines is perpendicular to the line 3x-5y=11 ?

Possible Answers:

3x+5y=-11

9y+15x-54=0

3y-5x=-3

5y+3x=2

10y-6x+5=0

Correct answer:

9y+15x-54=0

Explanation:

All we care about for this problem is the slopes of the lines...the x- and y-intercepts are irrelevant.

Remember that the slopes of perpendicular lines are opposite reciprocals. By putting the given equation into y=mx+b form, we can see that its slope is $\frac{3}{5}$ . So we are looking for a line with a slope of $-\frac{5}{3}$ .

The equation 9y+15x-54=0 can be put into the form $y=-\frac{5}{3}x+6$ , and so we know that it is perpendicular to the given line.

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Example Question #3 : How To Find Whether Lines Are Perpendicular

Line A passes through the origin and (8, 6) .

Line B passes through the origin and $\left ( -36, 64\right )$ .

Line C passes through the origin and $\left ( \frac{1}{12},- \frac{1}{16} \right )$ .

Line D passes through the origin and (0.9, -1.2) .

Line E passes through the origin and $\left ( \sqrt{2},-\sqrt{3} \right )$ .

Which line is perpendicular to Line A?

Possible Answers:

Line C

None of the other lines is perpendicular to A.

Line E

Line D

Line B

Correct answer:

Line D

Explanation:

Find the slopes of all five lines using the slope formula $m= \frac{y_{2}-y_{1}}{x_{2}-x_{1}}$ . Since each line passes through the origin, this formula can be simplified to

$m= \frac{y_{2}-0}{x_{2}-0} = \frac{y_{2} }{x_{2} }$

using the other point.

Line A:

$m = \frac{6 }{8 } = \frac{3}{4}$

The correct line must have as its slope the opposite of the reciprocal of this, which is $m = -\frac{4}{3}$ .

Line B:

$m = \frac{64 }{-36}= - \frac{16}{9}$

Line C:

$m = \frac{ -\frac{1}{16} }{ \frac{1}{12}} = -\frac{1}{16} \div \frac{1}{12} = -\frac{1}{16} \cdot \frac{12} {1}= -\frac{12}{16} = -\frac{3}{4}$

Line D:

$m = \frac{-1.2 }{0.9 } = -\frac{12}{9} = -\frac{4}{3}$

Line E:

$m = \frac{ - \sqrt{3}}{ \sqrt{2} } = -\frac{\sqrt{6}}{2}$

Of the last four lines, only Line D has the desired slope.

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Example Question #6 : How To Find Whether Lines Are Perpendicular

Line W passes through the origin and point $\left (\frac{1}{4}, \frac{1}{9} \right )$ .

Line X passes through the origin and point $\left (\frac{1}{4}, -\frac{1}{9} \right )$ .

Line Y passes through the origin and point $\left ( \frac{1}{9} , \frac{1}{4}\right )$ .

Line Z passes through the origin and point $\left ( \frac{1}{9} , -\frac{1}{4}\right )$ .

Which of these lines is perpendicular to the line of the equation 4x-9y = 100 ?

Possible Answers:

Line W

None of the other responses is correct.

Line X

Line Z

Line Y

Correct answer:

Line Z

Explanation:

First, find the slope of the line of the equation 4x-9y = 100 by rewriting it in slope-intercept form:

4x-9y = 100

-9y = -4x+100

$y =-\frac{1}{9} \left (-4x+100 \right )$

$y = \frac{4}{9} x-\frac{100 }{9}$

The slope of this line is $\frac{4}{9}$ , so we are looking for a line whose slope is the opposite of the reciprocal of this, or $-\frac{9}{4}$ .

Find the slopes of all four lines by using the slope formula $m= \frac{y_{2}-y_{1}}{x_{2}-x_{1}}$ . Since each line passes through the origin, this formula can be simplified to

$m= \frac{y_{2}-0}{x_{2}-0} = \frac{y_{2} }{x_{2} }$

using the other point.

Line W:

$m = \frac{y_{2} }{x_{2} }= \frac{ \frac{1}{9} }{ \frac{1}{4}} = \frac{1}{9} \div \frac{1}{4}= \frac{1}{9} \cdot \frac{4} {1} = \frac{4}{9}$

Line X:

$m = \frac{y_{2} }{x_{2} }= \frac{ - \frac{1}{9} }{ \frac{1}{4}} =- \frac{1}{9} \div \frac{1}{4}= -\frac{1}{9} \cdot \frac{4} {1} =- \frac{4}{9}$

Line Y:

$m = \frac{y_{2} }{x_{2} }= \frac{ \frac{1}{4} }{ \frac{1}{9}} = \frac{1}{4} \div \frac{1}{9}= \frac{1}{4} \cdot \frac{9} {1} = \frac{9}{4}$

Line Z:

$m = \frac{y_{2} }{x_{2} }= \frac{ -\frac{1}{4} }{ \frac{1}{9}} =-\frac{1}{4} \div \frac{1}{9}= -\frac{1}{4} \cdot \frac{9} {1} = -\frac{9}{4}$

Line Z has the desired slope and is the correct choice.

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Example Question #7 : How To Find Whether Lines Are Perpendicular

Determine whether the two equations are parallel, perpendicular or neither, and choose the best reason.

$-2x+6y = 3 \textup{ and } -\frac{y}{3}=1$

Possible Answers:

Perpendicular, the slopes are the negative reciprocal to each other.

Parallel, the slopes are the same.

Neither, the slopes have no correlation.

Parallel, the slopes are the negative reciprocal to each other.

Perpendicular, the slopes are the same.

Correct answer:

Neither, the slopes have no correlation.

Explanation:

Convert both equations to slope intercept form: y=mx+b

-2x+6y = 3

6y =2x+3

$y=\frac{1}{3}x+\frac{1}{2}$

The slope of the first equation is $m_1=\frac{1}{3}$ .

Convert the second equation.

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

y=-3

The slope of this equation is zero since there is no term! m_2=0

In order for the two functions to be parallel, they must have the same slopes.

In order for the two functions to be perpendicular, their slopes must be the negative reciprocal to each other.

Since there's no correlation with both slopes, the equations are neither parallel or perpendicular to each other.

The correct answer is:

Neither, the slopes have no correlation

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Example Question #6 : How To Find Whether Lines Are Perpendicular

Given: the following three lines on the coordinate plane:

Line 1: The line of the equation x = 7

Line 2: The line of the equation y = 7

Line 3: The line of the equation x+y=7

Which of the following is a true statement?

Possible Answers:

Line 1 and Line 2 are perpendicular; Line 3 is perpendicular to neither.

None of the other responses is correct.

Line 1 and Line 3 are perpendicular; Line 2 is perpendicular to neither.

Line 2 and Line 3 are perpendicular; Line 1 is perpendicular to neither.

No two of Line 1, Line 2, or Line 3 form a pair of perpendicular lines.

Correct answer:

Line 1 and Line 2 are perpendicular; Line 3 is perpendicular to neither.

Explanation:

Line 1, the line of the equation x = 7 , is a vertical line on the coordinate plane; Line 2, the line of the equation y = 7 , is a horizontal line. Lines 1 and 2 are perpendicular to each other.

The slope of Line 3, the line of the equation x+y=7 , can be calculated by putting the equation in slope-intercept form:

x+y=7

x+y-x=7 - x

y = -1x+7

The slope is , which makes it perpendicular to a line of slope $-\frac{1}{-1} = 1$ . Line 1, being vertical, has undefined slope, and Line 2, being horizontal, has slope 0.

Correct response: Line 1 and Line 2 are perpendicular; Line 3 is perpendicular to neither.

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SSAT Upper Level Math : SSAT Upper Level Quantitative (Math)

Study concepts, example questions & explanations for SSAT Upper Level Math

All SSAT Upper Level Math Resources

Example Questions

Example Question #1 : How To Find Whether Lines Are Parallel

Example Question #4 : How To Find Whether Lines Are Parallel

Example Question #651 : Ssat Upper Level Quantitative (Math)

Example Question #652 : Ssat Upper Level Quantitative (Math)

Example Question #653 : Ssat Upper Level Quantitative (Math)

Example Question #654 : Ssat Upper Level Quantitative (Math)

Example Question #3 : How To Find Whether Lines Are Perpendicular

Example Question #6 : How To Find Whether Lines Are Perpendicular

Example Question #7 : How To Find Whether Lines Are Perpendicular

Example Question #6 : How To Find Whether Lines Are Perpendicular

All SSAT Upper Level Math Resources

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