Question

Which function is the inverse of f(x) = -5x -4?

Answer 1

f^-1(x) = (x + 4) / -5

Explanation:

f(x) = -5x - 4 Substitute f(x) with y

y = -5x - 4 Switch the x and y variables

x = -5y - 4 Solve it down

x + 4 = -5y

y = (x + 4)/ -5

f^-1(x) = (x + 4) / -5 <----- This is the answer