Question

Which Line is Perpendicular to y= -1/4x - 8?

A) y=-4x+5
B) y=-1/4x-3
C) y=1/4x
D) y=4x+2

Answer 1

D

Explanation:

• For two lines to be perpendicular, their gradients must have a product of -1
• The only one that fits this is D

Answer 2

D

Explanation:

The product of the slope of the perpendicular lines are -1

y = -1/4x - 8

Slope = -1/4

D) y = 4x + 2

Slope = 4

`4 * (-1)/(4)=-1`