Question

Find the inverse of f(x) = 15,000 + 1.5x

Answer 1

let f(x) = y
y = 15,000 + 1.5x
1.5x = y - 15,000
x = (y - 15,000) / 1.5
so
f-1(x) = (x - 15,000) / 1.5