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Algebra 1 : Parallel Lines

Study concepts, example questions & explanations for Algebra 1

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10 Diagnostic Tests 557 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #71 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

5x+5y=10

Possible Answers:

y=x+3

$y=\frac{1}{5}x-9$

y=-x-2

y=5x+6

Correct answer:

y=-x-2

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

5x+5y=10

We need to isolate on the left side of the equation. Subtract from both sides of the equation.

5x-5x+5y=10-5x

Simplify.

5y=10-5x

Divide both sides of the equation by .

$\frac{5y}{5}=\frac{10}{5}-\frac{5x}{5}$

Simplify.

y=2-x

Rearrange terms to match the slope-intercept form.

y=-x+2

In the given equation:

m=-1

Parallel lines share the same slope.

Only one of the choices has a slope of .

y=-x-2

Report an Error

Example Question #121 : Parallel Lines

Which of the following pairs of lines are parallel?

Possible Answers:

y=4x-2

y=3x+9

$y=\frac{1}{2}x-8$

y=2x-1

y=2x-5

y=-2x+2

y=2x-2

y=2x+12

Correct answer:

y=2x-2

y=2x+12

Explanation:

Lines can be written in the slope-intercept form:

y=mx+b

In this form, equals the slope and represents where the line intersects the y-axis.

Parallel lines have the same slope: .

Only one choice contains tow lines with the same slope.

y=2x-2

y=2x+12

The slope for both lines in this pair is m=2 .

Report an Error

Example Question #73 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

7y-6x=1

Possible Answers:

y=-6x+12

$y=\frac{6}{7}x+\frac{1}{2}$

$y=\frac{7}{6}x+\frac{1}{3}$

$y=-\frac{6}{7}x-7$

Correct answer:

$y=\frac{6}{7}x+\frac{1}{2}$

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

7y-6x=1

We need to isolate on the left side of the equation. Add to both sides of the equation.

7y-6x+6x=1+6x

Simplify.

7y=1+6x

Divide both sides of the equation by .

$\frac{7y}{7}=\frac{1}{7}+\frac{6x}{7}$

Simplify.

$y=\frac{1}{7}+\frac{6}{7}x$

Rearrange terms to match the slope-intercept form.

$y=\frac{6}{7}x+\frac{1}{7}$

In the given equation:

$m=\frac{6}{7}$

Parallel lines share the same slope.

Only one of the choices has a slope of $\frac{6}{7}$ .

$y=\frac{6}{7}x+\frac{1}{2}$

Report an Error

Example Question #74 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

9x-5y=16

Possible Answers:

$y=-\frac{9}{5}x-1$

$y=\frac{9}{5}x+5$

$y=\frac{5}{9}x-\frac{12}{13}$

y=9x+2

Correct answer:

$y=\frac{9}{5}x+5$

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

9x-5y=16

We need to isolate on the left side of the equation. Subtract from both sides of the equation.

9x-9x-5y=16-9x

Simplify.

-5y=16-9x

Divide both sides of the equation by .

$\frac{-5y}{-5}=\frac{16}{-5}-\left ( \frac{9x}{-5} \right )$

Simplify. Remember that when a positive number is divided by a negative number, the answer is always negative.

. $y=-\frac{16}{5}-\left ( -\frac{9}{5}x\right )$

Subtracting a negative number is the same as adding a positive number. Rewrite.

$y=-\frac{16}{5}+\frac{9}{5}x$

Rearrange terms to match the slope-intercept form.

$y=\frac{9}{5}x-\frac{16}{5}$

In the given equation:

$m=\frac{9}{5}$

Parallel lines share the same slope.

Only one of the choices has a slope of $\frac{9}{5}$ .

$y=\frac{9}{5}x+5$

Report an Error

Example Question #122 : Parallel Lines

Find a line parallel to the line with the equation:

2x-y=1

Possible Answers:

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

$y=-2x-\frac{1}{7}$

$y=-x-\pi$

$y=2x+\pi$

Correct answer:

$y=2x+\pi$

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

2x-y=1

We need to isolate on the left side of the equation. Subtract from both sides of the equation.

2x-2x-y=1-2x

Simplify.

-y=1-2x

Divide both sides of the equation by .

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

Simplify. Remember that when a positive number is divided by a negative number, the answer is always negative.

$y=-1-\left ( -2x\right )$

Subtracting a negative number is the same as adding a positive number. Rewrite.

y=-1+2x

Rearrange terms to match the slope-intercept form.

y=2x-1

n the given equation:

m=2

Parallel lines share the same slope.

Only one of the choices has a slope of .

$y=2x+\pi$

Report an Error

Example Question #71 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

20y-16x=40

Possible Answers:

$y=\frac{5}{4}x-8$

$y=\frac{4}{5}x+\frac{1}{2}$

y=16x+6

$y=\frac{1}{4}x-5$

Correct answer:

$y=\frac{4}{5}x+\frac{1}{2}$

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

20y-16x=40

We need to isolate on the left side of the equation. Add 16x to both sides of the equation.

20y-16x+16x=40+16x

Simplify.

20y=40+16x

Divide both sides of the equation by .

$\frac{20y}{20}=\frac{40}{20}+\frac{16x}{20}$

Simplify.

$y=2+\frac{16}{20}x$

Reduce.

$y=2+\frac{4}{5}x$

Rearrange terms to match the slope-intercept form.

$y=\frac{4}{5}x+2$

In the given equation:

$m=\frac{4}{5}$

Parallel lines share the same slope.

Only one of the choices has a slope of $\frac{4}{5}$ .

$y=\frac{4}{5}x+\frac{1}{2}$

Report an Error

Example Question #77 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

7y-14x=16

Possible Answers:

$y=\frac{1}{2}x-\frac{12}{17}$

y=-14x+16

y=-2x+4

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

Correct answer:

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

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

7y-14x=16

We need to isolate on the left side of the equation. Add 14x to both sides of the equation.

7y-14x+14x=16+14x

Simplify.

7y=16+14x

Divide both sides of the equation by .

$\frac{7y}{7}=\frac{16}{7}+\frac{14x}{7}$

Simplify.

$y=\frac{16}{7}+2x$

Rearrange terms to match the slope-intercept form.

$y=2x+\frac{16}{7}$

In the given equation:

m=2

Parallel lines share the same slope.

Only one of the choices has a slope of .

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

Report an Error

Example Question #78 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

12y-18x=24

Possible Answers:

y=-18x+24

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

$y=-\frac{3}{2}x+10$

$y=\frac{3}{2}x-8$

Correct answer:

$y=\frac{3}{2}x-8$

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

First, put the given line in y=mx+b form.

12y-18x=24

We need to isolate on the left side of the equation. Add 18x to both sides of the equation.

12y-18x+18x=24+18x

Simplify.

12y=24+18x

Divide both sides of the equation by .

$\frac{12y}{12}=\frac{24}{12}+\frac{18x}{12}$

Simplify.

$y=2+\frac{18}{12}x$

Reduce.

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

Rearrange terms to match the slope-intercept form.

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

n the given equation:

$m=\frac{3}{2}$

Parallel lines share the same slope.

Only one of the choices has a slope of $\frac{3}{2}$ .

$y=\frac{3}{2}x-8$

Report an Error

Example Question #81 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

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

Possible Answers:

$y=\frac{1}{2}x+\frac{17}{2}$

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

y=3x+9

$y=2x-\frac{4}{5}$

Correct answer:

$y=\frac{1}{2}x+\frac{17}{2}$

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

In the given equation:

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

Parallel lines share the same slope.

Only one of the choices has a slope of $\frac{1}{2}$ .

$y=\frac{1}{2}x+\frac{17}{2}$

Report an Error

Example Question #82 : How To Find Out If Lines Are Parallel

Find a line parallel to the line with the equation:

y=6x+3

Possible Answers:

y=-6x+6

y=6x-14

y=6

$y=\frac{1}{6}x-9$

Correct answer:

y=6x-14

Explanation:

Lines can be written in the slope-intercept format:

y=mx+b

In this format, equals the line's slope and represents where the line intercepts the y-axis.

In the given equation:

m=6

Parallel lines share the same slope.

Only one of the choices has a slope of .

y=6x-14

Report an Error

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Algebra 1 : Parallel Lines

Study concepts, example questions & explanations for Algebra 1

All Algebra 1 Resources

Example Questions

Example Question #71 : How To Find Out If Lines Are Parallel

Example Question #121 : Parallel Lines

Example Question #73 : How To Find Out If Lines Are Parallel

Example Question #74 : How To Find Out If Lines Are Parallel

Example Question #122 : Parallel Lines

Example Question #71 : How To Find Out If Lines Are Parallel

Example Question #77 : How To Find Out If Lines Are Parallel

Example Question #78 : How To Find Out If Lines Are Parallel

Example Question #81 : How To Find Out If Lines Are Parallel

Example Question #82 : How To Find Out If Lines Are Parallel

All Algebra 1 Resources

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