Inverse Functions: Show (a) Analytically & (b) Graphically

[duki]

Homework Statement

Show that f and g are inverse functions (a) analytically and (b) graphically.

f(x) = 5x+1
g(x) = (x-1)/5

Homework Equations

I've got (a), but I'm unsure at how to solve for (b).

The Attempt at a Solution

Here's my (a): $$f(g(x)) = 5(x-1/5) + 1 = x$$
How do I solve graphically?

 

[NateTG]

The inverse of a function is the function reflected across the line x=y.