Question

The equation of line CD is (y−3) = − 2 (x − 4). What is the slope of a line perpendicular to line CD?

a. 1 over 2
b. 2
c. negative 1 over 2
d. −2

Answer 1

`(y-3)=-2(x-4) \\ y-3 = -2x+8 \\ y=-2x+11`
Slope: -2

NOTE: The line perpendicular to line
`y=mx+b` has a slope
`-(1)/(m)`.

So your slope is
`-(1)/(-2)=(1)/(2)` - 1 over 2 (Answer a)