\begin{exercice}\label{2G4_base_solution_graphique_systeme}
\`A l'aide du graphique ci-dessous, donner les solutions des systèmes suivants.
\begin{center}
\begin{tikzpicture}[general, scale=0.8]
\draw [quadrillage](-4,-3) grid (5,3);
\axeX{-4}{5}{1}
\axeY{-3}{3}{1}
\origine
\draw [epais,color=J1] (-2,3)--(4,-3);
\draw [epais,color=B2](-4,2)--(1,-3);
\draw [epais,color=G1]  (-0.5,3)--(-3.5,-3);
\end{tikzpicture}
 \end{center}
 \begin{colenumerate}{3}
\item {$\left\lbrace \begin{array}{l}y=2x+4\\y=-x+1\end{array}\right.$}
\item {$\left\lbrace \begin{array}{l}y=-x+1\\y=-x-2\end{array}\right.$}
\item {$\left\lbrace \begin{array}{l}y=2x+4\\y=-x-2\end{array}\right.$}
\end{colenumerate}
\end{exercice}
