Pre calc, question 10, make the answer bold please, Thanks!

given:
f(x) = -1/4(x) - 1
To find the inverse; first we solve for x and then we change the variables, as follows:
y = -1/4(x) - 1
y - 1 = -1/4(x)
x = -4y - 4; so:
f⁻¹(x) = -4x - 4
Graphs: (red one is the original and blue comes into the inverse)