To find the inverse, we need to solve for x in term of f(x)
f(x) = 5x + 4
5x + 4 = f(x)
Solve for x
5x + 4 = f(x)
5x = f(x) - 4
x = [tex] \cfrac{f(x)-4}{5} [/tex]
x acts as the invers of f(x), and f(x) is the invers of x, so the inverse function will be
f⁻¹(x) = [tex] \cfrac{x-4}{5} [/tex]
