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High School Math : Parallel Lines

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Example Question #1 : How To Find Out If Lines Are Parallel

Which of these lines is parallel to $y=\frac{2}{3}x+\frac{5}{6}$ ?

Possible Answers:

y=x

$y=\frac{2}{3}x-12$

$y=-\frac{3}{2}x+\frac{5}{6}$

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

$y=\frac{3}{2}x+\frac{5}{6}$

Correct answer:

$y=\frac{2}{3}x-12$

Explanation:

Lines are parallel if they have the same slope. In standard y=mx+b form, is the slope.

For our given equation, the slope is $\frac{2}{3}$ . Only $y=\frac{2}{3}x-12$ has the same slope.

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Example Question #41 : Algebra I

Which of the following lines is parallel to y = 5x + 3 ?

Possible Answers:

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

y = 5x - 10

y = 7x + 2

y = -5x + 7

$y = -\frac{1}{5}x + 6$

Correct answer:

y = 5x - 10

Explanation:

Two lines that are parallel have the same slope. The slope of y = 5x + 3 is , so we want another line with a slope of . The only other line with a slope of is y = 5x - 10 .

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Example Question #3 : How To Find Out If Lines Are Parallel

Which of these lines is parallel to $y=\frac{4}{7}x+\frac{1}{3}$ ?

Possible Answers:

$y=\frac{7}{4}x+\frac{1}{3}$

$y=\frac{4}{7}x-1$

y=-x

$y=-\frac{7}{4}x^$

$y=-\frac{4}{7}x+\frac{2}{3}$

Correct answer:

$y=\frac{4}{7}x-1$

Explanation:

Lines are parallel if they have the same slope. In standard y=mx+b form, is the slope.

For our given equation, the slope is $\frac{4}{7}$ . Only $y=\frac{4}{7}x-1$ has the same slope.

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Example Question #1 : How To Find Out If Lines Are Parallel

Which of the following lines will be parallel to $y=\frac{3}{4}x+12$ ?

Possible Answers:

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

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

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

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

$y=\frac{3}{4}x-5$

Correct answer:

$y=\frac{3}{4}x-5$

Explanation:

Two lines are parallel if they have the same slope. When a line is in standard y=mx+b form, the is the slope.

For the given line $y=\frac{3}{4}x+12$ , the slope will be $\frac{3}{4}$ . Only one other line has a slope of $\frac{3}{4}$ : $y=\frac{3}{4}x-5$

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Example Question #1 : How To Find Out If Lines Are Parallel

Are the following lines parallel?

y = 2x - 5

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

Possible Answers:

Yes

It cannot be determined from the information given

Correct answer:

Explanation:

By definition, two lines are parallel if they have the same slope. Notice that since we are given the lines in the y = mx + b format, and our slope is given by , it is clear that the slopes are not the same in this case, and thus the lines are not parallel.

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Example Question #6 : How To Find Out If Lines Are Parallel

Which of the following lines is parallel to the line $y=\frac{1}{4}x-3$ ?

Possible Answers:

$y= \frac {1}{4}$

y=-4x- 3

$y= \frac {1}{4} x-20$

y=x

y=-x

Correct answer:

$y= \frac {1}{4} x-20$

Explanation:

Parallel lines have the same slope. In slope-intercept form, y=mx+b , is the slope.

$y=\frac{1}{4}x-3$

Here the slope is $\frac{1}{4}$ ; thus, any line that is parallel to the line in question will also have a slope of $\frac{1}{4}$ .

Only one answer choice satisfies this requirement: $y= \frac {1}{4} x-20$

Note: the answer choice $y= \frac {1}{4}$ is incorrect. If put into y=mx+b form, the equation becomes $y =0x+\frac{1}{4}$ . Therefore the slope is actually , not $\frac{1}{4}$ .

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Example Question #1 : How To Find The Slope Of Parallel Lines

Which of the following lines would be parallel to the line described by the equation?

y=2x-12

Possible Answers:

y=2

$y=-\frac{1}{2}x-9$

y=2x+5

y=-2x+8

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

Correct answer:

y=2x+5

Explanation:

The way to determine parallel lines is to look at the slope. That means when you look at the equation in slope-intercept form, y=mx+b , you're looking at the .

y=2x-12

In the given problem, the slope is . Parallel lines will have identical slopes; thus, any line that is parallel to the line described by the equation would ALSO have a slope of . Only one answer choice satisfies that requirement:

y=2x+5 .

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Example Question #2 : How To Find The Slope Of Parallel Lines

Which of the following lines would be parallel to $y=22x+\frac{3}{4}$ ?

Possible Answers:

y=22x-13

y=20x+2

$y=\frac{1}{22}x+3$

y=22

$y=-\frac{1}{22}x+\frac{3}{4}$

Correct answer:

y=22x-13

Explanation:

Two lines are parallel if they have the same slope. When looking at the standard line equation y=mx+b , the important thing is that the 's are the same. In this case, the given equation has a slope of . Only one answer choice also has a slope of .

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Example Question #3 : How To Find The Slope Of Parallel Lines

What is the slope of the line that runs through points $\left ( -10,5 \right )$ and $\left ( 4,-3 \right )$ ?

Possible Answers:

$-\frac{4}{7}$

$\frac{7}{4}$

$-\frac{9}{14}$

$\frac{14}{8}$

$\frac{4}{7}$

Correct answer:

$-\frac{4}{7}$

Explanation:

Use the slope formula (difference between 's over difference between 's) to find that the slope is $-\frac{4}{}7$ .

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Example Question #4 : How To Find The Slope Of Parallel Lines

A line that is parallel to y = -2x + 6 will have what slope?

Possible Answers:

$\frac{1}{2}$

$-\frac{1}{2}$

Correct answer:

Explanation:

Two lines that are parallel have the same slope. The line given above is in slope-intercept form, y = mx + b , where represents the slope. Thus, the slope is . Therefore, any line that is parallel to this line will also have a slope of -2.

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High School Math : Parallel Lines

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #1 : How To Find Out If Lines Are Parallel

Example Question #41 : Algebra I

Example Question #3 : How To Find Out If Lines Are Parallel

Example Question #1 : How To Find Out If Lines Are Parallel

Example Question #1 : How To Find Out If Lines Are Parallel

Example Question #6 : How To Find Out If Lines Are Parallel

Example Question #1 : How To Find The Slope Of Parallel Lines

Example Question #2 : How To Find The Slope Of Parallel Lines

Example Question #3 : How To Find The Slope Of Parallel Lines

Example Question #4 : How To Find The Slope Of Parallel Lines

All High School Math Resources

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