\begin{exercice}
Même énoncé que l'exercice \RefExercice{2G5_E_lireequationdedroite}.
\begin{center}
\begin{tikzpicture}[general, scale=0.85]
\draw [quadrillage](-4,-3) grid (5,3);
\axeX{-4}{5}{-3,-2,-1,1,2,3,4}
\axeY{-3}{3}{-2,-1,1,2}
\origine
\draw [epais,color=A1] (-2,3)--(2,-3);
\draw [epais,color=C1](-4,-2.333)--(5,0.667);
\draw[color=A1] (-1.3,2.69) node {{\boldmath ${\cal D}_5$}};
\draw[color=C1] (-3.67,-2.52) node {{\boldmath ${\cal D}_6$}};
\end{tikzpicture}
 \end{center}
 \end{exercice}
 