To find the inverse of f(x) = -8x + 4,
1) replace "f(x)" with "Y:" y = -8x + 4
2) interchange x and y: x = -8y + 4
3) solve this result for y: -8y = x - 4, or y = (x - 4)/(-8)
-1
4) replace this "y" with f (x): ":
-1 x - 4
f (x) = - ----------
8
