Answer:
x - 7/9 = f(x)^-1
Step-by-step explanation:
f(x) = 9x + 7
y - 7 = 9x
y - 7/9 = 9x/9
Interchange!
x - 7/9 = y
x = 5
11 = 4x-9
20 = 4x
20/4 = 4x/4
5 = x
B
