Question

For f (x)= -x + 8, what is the value of x for which f(x) = 9?

Answer 1

x=-1

Explanation:

f (x)= -x + 8

Let f(x) = 9

9 = -x+8

Subtract 8 from each side

9-8 = -x+8-8

1 = -x

Multiply each side by -1

-1 = x