Which function is the inverse of f (x) = - 5x-42

f' (x) = - (x+42) / 5

Step-by-step explanation:

Rewrite f (x) as y:

y=-5x-42

Flip x and y and solve for y:

x=-5y-42

x+42=-5y

(x+42) / -5=y

So the inverse function is f' (x) = - (x+42) / 5 (note that f' means inverse)