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

% Ex. No. 7 (Section  5.1.1 : Changing the drawing size with \tkzcname{tkzInit})

\begin{tikzpicture}
   \tkzInit[xmax=8,ymax=6]
   \tkzGrid
   \tkzAxeXY
   \draw[blue](-1,0)--(6,7);
\end{tikzpicture}

\end{document}