Homomorphic image of a free group Given a group $G$ with a generating set $S$, such that $|S|=n$, I need to prove that $G$ is a homomorphic image of $F_n$. 
Right now I'm just looking for any tips for how to even start this proof or how to start thinking about the question. 

Hint: $F_n$ is a free object in the category of groups i.e $Hom_{Group}(F_n,G)=Hom_{Set}(\{1,...,n\},G)$.
This is equivalent to saying that the forgetful functor from the category of sets to the category of groups has a left adjoint which associates to a set $S$ the free group $F_S$.
