3/09/2021 Parallel and Perpendicular Lines

Slopes of parallel lines are...

• opposite reciprocals

• opposites

• identical

• reciprocals

Slopes of perpendicular lines are...

• opposite reciprocals

• opposites

• identical

• reciprocals

What slope is perpendicular to:  
m = 5/8

• -5/8
• 5/8
• -8/5
• 8/5

What slope is parallel to:

m = 4

• 4

• -1/4

• -4

• 1/4

What slope is perpendicular to:

m = -3

• -3

• -1/3

• 1/3

• 3

Are these lines parallel, perpendicular, or just intersecting (but not perpendicular)?

 $y=6x+2$  $y=-6x-2$   

• Parallel

• Perpendicular

• Intersecting (but not perpendicular)

Select all that are true.

• Parallel lines never intersect.

• Parallel lines intersect at a right angle.

• Perpendicular lines never intersect.

• Perpendicular lines intersect at a right angle.

y = 5/7x +2
y = 5/7x - 30
These lines are...

• Parallel
• Perpendicular
• Neither

y = 6x + 2
y = -6x + 2
These lines are...

• Parallel
• Perpendicular
• Neither

y = -2/3x + 2
y = 3/2x + 9
These lines are...

• Parallel
• Perpendicular
• Neither