How do you solve this equation?

Afunction is given: f(x)=3x+12 a. determine the inverse of this function and name it g(x) b. use composite functions to show that these functions are inverses. c. f(g(– explain: what is the domain?

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

What is a graph with a never ending line called?