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\documentclass{minimal}
\usepackage{pstricks-add}
\begin{document}
\begin{center}
\pspicture(-3,-3)(3,3.5)
\psaxes{<->}(0,0)(5,5)(-5,-5)
\psplot[arrows=<->,linewidth=2pt,linecolor=red]{1}{5}{4 x 1 sub div}
\psplot[arrows=<->,linewidth=2pt,linecolor=red]{-5}{-1}{ 4 x 1 sub div}
\endpspicture
\end{center}
\end{document}
Nick