Parallel Perpendicular Same Lines

Slopes of parallel lines are...

• negative reciprocals.

• opposites.

• the same.

• always 7.

Slopes of perpendicular lines are...

• negative reciprocals.

• opposites.

• the same.

• always 7.

What slope is perpendicular to:  
m = 5/8

• -5/8

• 5/8

• -8/5

• 8/5

What slope is perpendicular to:  
m = 3

• -3

• -1/3

• 1/3

• 3

• line s

• line t

• line m

• line l

• line s

• line t

• line m

• line l

• line l

• line m

• line s

• line t

• line l

• line m

• line s

• line t

• line s

• line t

• line m

• line l

Are these two lines parallel, perpendicular or neither?
y = -1/3x - 5
y = 1/3x + 2

• Parallel

• Perpendicular

• Neither