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. 

I think the following definition (the most easy to grab and/or standard I know) of a free group will solve the problem: 
The group $\;F_n\;$ is free on $\;S:=\{s_1,...,s_n\}\;$ iff for any function $\;f:S\to G\;,\;\;G\;$ any group,
there exists a unique homomorphism $\;\phi:F_n\to G\;$ extending $\;f\;$ , meaning: such that $\;\left.\phi\right|_S=f\;$
