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\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 8 (Section  4.6 : Les fonctions affines ou linéaires)

 \begin{tikzpicture}[]
 \tkzInit[ymax=20,ystep=5]
 \tkzAxeXY
 \tkzFct[color=red,domain=0:10,samples=2]{2*x+5}
 \tkzFct[color=blue,domain=0:10,samples=2]{-x+15}
 \tkzFct[color=green,domain=0:10,samples=2]{7} % 7/5=1
 \tkzFct[color=purple,domain=0:10,samples=2]{7.}%7.0/5 =1.2
\end{tikzpicture}

\end{document}