Answer:
[tex]y = \frac{x}{5}[/tex]
Step-by-step explanation:
I am going to assume that by "f-1(x)" you mean [tex]f(x)^{-1}[/tex], which makes this an inverse function problem. To find the inverse of a function, simply swap x and y, then solve for y.
[tex]x = 5y\\y = \frac{x}{5}[/tex]
