Writing Equations of Parallel and Perpendicular Lines

What is true about the slopes of parallel lines?

• They have no slope.

• They intersect at a right angle.

• They have the same slope.

• They have different slopes.

Tags

CCSS.8.EE.B.5

How can you confirm if two lines are parallel?

• By checking if they intersect.

• By calculating their slopes and seeing if they are equal.

• By checking if they are on the same axis.

• By measuring the distance between them.

What is the slope of a line passing through points (1, 2) and (4, 5)?

• 1

• 2

• 3

• 1/3

Tags

CCSS.8.EE.B.5

If line A has a slope of 3 and line B has a slope of 4, are they parallel?

• Yes

• Only if they are on the same plane

• No

• Only if they intersect

What is the slope of a line parallel to y = 2x + 3?

• -2

• -3

• 3

• 2

Tags

CCSS.8.EE.B.5

How do you find the y-intercept of a line parallel to y = 2x + 3 passing through (5, -4)?

• By finding the midpoint

• By using the slope-intercept form and solving for b

• By using the point-slope form

• By setting x to 0

What is true about the slopes of perpendicular lines?

• They are both negative.

• They are both positive.

• They are negative reciprocals of each other.

• They are equal.

Tags

CCSS.8.EE.B.6

If a line has a slope of 2, what is the slope of a line perpendicular to it?

• -1/2

• 2

• 1/2

• -2

Tags

CCSS.8.EE.B.6

What is the negative reciprocal of the slope 3/4?

• -4/3

• 4/3

• -3/4

• 3/4

Tags

CCSS.8.EE.B.5

How do you write the equation of a line perpendicular to y = 1/2x + 3 passing through (2, -1)?

• Use the slope-intercept form with slope 2

• Use the point-slope form with slope -2

• Use the slope-intercept form with slope -1/2

• Use the point-slope form with slope 1/2