If the graphs of linear functions f(x)=2x+9 and g(x)=−ax+9 are perpendicular, what is the value of a? a) -2 b)-1/2 c)-9/2 d)1/2 e)2

d) 1/2

Step-by-step explanation:

The slopes of perpendicular lines multiply to give -1. Here, the slopes of the lines are 2 (for f(x)) and -a (for g(x)).

... 2·(-a) = -1

... a = -1/-2 = 1/2 . . . . . . divide by the coefficient of a

i think 1: 2

step-by-step explanation:

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign