Question

If f(x)=5x-7 then f^-1=__ _

Answer 1

f^-1(x) = (x +7)/5

Explanation:

Set x = f(y) and solve for y.

... x = 5y -7

... x+7 = 5y

... (x+7)/5 = y . . . . this is the inverse function

f^-1(x) = (x +7)/5