Question

What is the slope of a line perpendicular to the line with equation y = 4x + 5?

A.
–4

B.
–5

C.
4

D. -1/4

Answer 1

D?

Answer 2

yep :)
The gradient of that equation would be 4
And since it tells you the two lines are perpendicular
4 multiplied by the gradient of your perpendicular line would give you -1
So your slope would be -1/4

Answer 3

Thanks!