Question 609987
f(x) = y = 5 + (1/7)x

To find the inverse, swap the y and the x and solve for y:

x = 5 + (1/7)y
x - 5 = (1/7)y
y = 7x - 35

You can graph these and check they are inverses because they are mirror images across the line y = x.

{{{ graph( 200, 200, -25, 25, -25, 25, 5 + (1/7)x, 7x - 35, x)}}}