%% 
%%  A DANTE-Edition example
%% 
%%  Example 10-04-3 on page 116.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{177.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-plot}

\begin{document}
\begin{pspicture}(-2,-0.5)(2,5.5)
  \psclip{%
    \pscustom[linestyle=none]{%
       \psplot{-2}{2}{x dup mul 1 add}}
    \pscustom[linestyle=none]{%
       \psplot{2}{-2}{x dup mul neg 5 add}}%
  }% end of \psclip
    \psframe*[linecolor=lightgray](-2,0)(2,5)
  \endpsclip
  \psaxes{->}(0,0)(-2,-0.5)(2,5.5)
  \psplot{-2}{2}{x dup mul 1 add}
  \psplot{2}{-2}{x dup mul neg 5 add}
  \uput[-90](2,0){x}
  \uput[0](0,5.5){y}
\end{pspicture}
\end{document}