I've been racking my brain trying to figure this out and I'm relatively certain it is an easy fix as I can logic the question out but can't figure out the mathematics essentially given an equation for f(x) such as 2x+1 and f (3)=g (1) solve for g (x) how would I go about doing this mathematically

You say "essentially". What is the question "exactly" (and the instructions)? Thanks.I've been racking my brain trying to...figure out the mathematics essentially given an equation for f(x) such as 2x+1 and f (3)=g (1) solve for g (x) how would I go about doing this mathematically