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Intermediate Geometry : How to find the equation of a parallel line

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Example Questions

Example Question #1 :Lines

What is the equation of a line that is parallel to the line $小y = \ \压裂{1}{2}x + 3$ and includes the point (4, 2) ?

Possible Answers:

$小y = \ \压裂{1}{2}x + 6$

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

$\small y=2x-6$

$\small y=-2x+10$

Correct answer:

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

Explanation:

The line parallel to $小y = \ \压裂{1}{2}x + 3$ must have a slope of $\frac{1}{2}$ , giving us the equation $\small y=\frac{1}{2}x+b$ . To solve forb, we can substitute the values foryandx.

$\small 2=(\frac{1}{2})(4)+b$

$\small 2=2+b$

$\small b=0$

Therefore, the equation of the line is $\small y=\frac{1}{2}x$ .

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Example Question #21 :Parallel Lines

Suppose a line y=2x . What is the equation of a parallel line that intersects point (1,3) ?

Possible Answers:

y=2x+3

y=2x+1

y=2x+4

y=2x+5

y=2x+2

Correct answer:

y=2x+1

Explanation:

A line parallel to y=2x must have a slope of two. Given the point (1,3) and the slope, use the slope-intercept formula to determine the-intercept by plugging in the values of the point and solving for:

y=mx+b

3=(2)(1)+b

3=2+b

3-2=2+b-2

b=1

Plug the slope and the-intercept into the slope-intercept formula:

y=2x+1

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Example Question #1 :How To Find The Equation Of A Parallel Line

Find the equation of the line parallel to 3x+3y=1 that passes through the point (2,2) .

Possible Answers:

y=3x-4

y=-x-4

y=3x+4

y=x-2

y=-x+4

Correct answer:

y=-x+4

Explanation:

Write 3x+3y=1 in slope intercept form, y=mx+b , to determine the slope,:

3y=-3x+1

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

The slope is:

m=-1

鉴于边坡,使用点 (2,2) and the equation y=mx+b to solve for the value of the-intercept,. Substitute the known values.

2=(-1)(2)+b

b=4

With the known slope and the-intercept, plug both values back to the slope intercept formula. The answer is y=-x+4 .

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Example Question #1 :How To Find The Equation Of A Parallel Line

Given y=3x+20 , find the equation of a line parallel.

Possible Answers:

y=0.3x+20

$y=\frac{-1}{3}-20$

y=-3x-12

y=3x-12

$y=\frac{1}{3}x-20$

Correct answer:

y=3x-12

Explanation:

The definition of a parallel line is that the lines have the same slopes, but different intercepts. The only answer with the same slope is y=3x-12 .

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Example Question #3 :How To Find The Equation Of A Parallel Line

Which one of these equations is parallel to:

y=3x+4

Possible Answers:

y=4

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

y=-3x+7

y=3x+1

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

Correct answer:

y=3x+1

Explanation:

Equations that are parallel have the same slope.

For the equation:

y=3x+4

The slope issince that is how muchchanges with increment of.

The only other equation with a slope ofis:

y=3x+1

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Example Question #4 :How To Find The Equation Of A Parallel Line

What equation is parallel to:

y=x

Possible Answers:

y=-x+1

y=x+42746

y=0

y=2x

y=x^2+4

Correct answer:

y=x+42746

Explanation:

To find a parallel line to

y=x

we need to find another equation with the same slope ofor.

The only equation that satisfies this is y=x+42746 .

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Example Question #5 :How To Find The Equation Of A Parallel Line

What equation is parallel to:

y=5x+5

Possible Answers:

y=5x+10

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

y=4x+3

y=x+5

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

Correct answer:

y=5x+10

Explanation:

To find an equation that is parallel to

y=5x+5

we need to find an equation with the same slope of.

Basically we are looking for another equation with.

The only other equation that satisfies this is

y=5x+10 .

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Example Question #211 :Coordinate Geometry

A line is parallel to the line of the equation

5x+ 7y = 32

and passes through the point (-2, 8) .

Give the equation of the line in standard form.

Possible Answers:

None of the other choices gives the correct response.

5x+ 7y = 46

7x + 5y= 26

5x- 7y = -66

7x- 5y= -54

Correct answer:

5x+ 7y = 46

Explanation:

Two parallel lines have the same slope. Therefore, it is necessary to find the slope of the line of the equation

5x+ 7y = 32

Rewrite the equation in slope-intercept form y = mx+ b ., the coefficient of, will be the slope of the line.

Add -5x to both sides:

5x+ 7y + (-5x ) = 32 + (-5x )

7y = -5x+32

Multiply both sides by $\frac{1}{7}$ , distributing on the right:

$\frac{1}{7} \cdot 7y = \frac{1}{7} \cdot( -5x+32)$

$y = -\frac{5}{7}x+\frac{32}{7}$

The slope of this line is $-\frac{5}{7}$ . The slope of the first line will be the same. The slope-intercept form of the equation of this line will be

$y =-\frac{5}{7}x+b$ .

To find, set x = -2 and y = 8 and solve:

$8 =-\frac{5}{7} (-2)+b$

$8 = \frac{10}{7} +b$

$\frac{56}{7} = \frac{10}{7} +b$

Subtract $\frac{10}{7}$ from both sides:

$\frac{56}{7} - \frac{10}{7} = \frac{10}{7} +b - \frac{10}{7}$

$b = \frac{46}{7}$

The slope-intercept form of the equation is $y =-\frac{5}{7}x+ \frac{46}{7}$

To rewrite in standard form with integer coefficients:

Multiply both sides by 7:

$7 y =7\left (-\frac{5}{7}x+ \frac{46}{7} \right )$

$7 y =7\left (-\frac{5}{7}x \right ) +7\left ( \frac{46}{7} \right )$

7 y =-5x +46

Addto both sides:

7 y + 5x =-5x +46 + 5x

5x+ 7y = 46 ,

the correct equation in standard form.

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Intermediate Geometry : How to find the equation of a parallel line

Study concepts, example questions & explanations for Intermediate Geometry

All Intermediate Geometry Resources

Example Questions

Example Question #1 :Lines

Example Question #21 :Parallel Lines

Example Question #1 :How To Find The Equation Of A Parallel Line

Example Question #1 :How To Find The Equation Of A Parallel Line

Example Question #3 :How To Find The Equation Of A Parallel Line

Example Question #4 :How To Find The Equation Of A Parallel Line

Example Question #5 :How To Find The Equation Of A Parallel Line

Example Question #211 :Coordinate Geometry

All Intermediate Geometry Resources

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