f(x)=(-1/5)x+3/5

g(x)=-5x+3

that's the question...

this is how I started...

y=-1/5x+3/5

1/5x-3/5-y

x=3-5y

y=3-5x

f^-1(x)=3-5x or f^-1(x=5x+3)=g(x)

I need to figure out if they are inverses of each other.... and I need to prove it algebraically.