Parallel Perpendicular Same Line

Select ALL of the lines that are PERPENDICULAR to y = 3/4x + 9

• y = 3/4x - 3

• y = -3/4x + 9

• y = -4/3x + 8

• 3y = -4x + 5

• 4y = -3x + 7

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

• line l

• line m

• line s

• line t

• 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 s

• line t

• line m

• line l

What slope is perpendicular to:  
m = 3

• -3

• -1/3

• 1/3

• 3