Image :

(La)TeX

Source :

\psset{unit=5mm}
\begin{pspicture}(18,20)
\psgrid[gridlabelcolor=white,subgriddiv=2]
\psline[linewidth=2pt]{->}(18,0)
\psline[linewidth=2pt]{->}(0,20)
\uput[dl](0,0){O} \uput[d](1,0){1} \uput[l](0,1){1}
\uput[d](17,0){$x$} \uput[l](0,19){$y$}
\end{pspicture}
    

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