\begin{exercice} On considère les quatre droites $d_1$, $d_2$, $d_3$ et $d_4$ tracées dans le repère ci-dessous.

\vspace{1mm}

{\centering
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\begin{pspicture*}(-4.12,-2.2)(4.4,5.28)
\psgrid[subgriddiv=0,gridlabels=0,gridcolor=CyanTikz40](0,0)(-4.12,-2.2)(4.4,5.28)
\psset{xunit=0.8cm,yunit=0.8cm,algebraic=true,dotstyle=o,dotsize=3pt 0,linewidth=0.8pt,arrowsize=3pt 2,arrowinset=0.25}
\psaxes[labels=none,xAxis=true,yAxis=true,Dx=1,Dy=1,ticksize=-2pt 0,subticks=0]{->}(0,0)(-4,-2)(4,5)
\psline[linecolor=A1](2.5,-2)(2.5,5)
\psplot[linecolor=B1]{-3}{4}{(--1--1*x)/1}
\psplot[linecolor=C1]{-3}{4}{(-0-2*x)/-3}
\psplot[linecolor=H1]{-4}{2}{(-6-2*x)/-2}
\rput(1,-0.5){1}
\rput(-0.5,1){1}
\rput[tl](-1.88,2.2){$d_1$}
\rput[tl](1.16,3.18){$d_2$}
\rput[tl](1.4,1.8){$d_3$}
\rput[tl](1.96,-0.86){$d_4$}
\rput[bl](2.66,9.5){$a$}
\rput[bl](-8.68,-7.4){$b$}
\rput[bl](-8.68,-5.56){$c$}
\rput[bl](-8.68,-5.4){$d$}
\end{pspicture*}
\par}


Associer chaque droite à son équation.
\begin{colenumerate}{2}
	\item $-x+y-1=0$
	\item $2x-5=0$
	\item $2x-2y+6=0$
	\item $2x-3y=0$
\end{colenumerate}
\end{exercice}