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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-10-6 on page 225.
+%% 
+%%  Copyright (C) 2010 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[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{201.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\makeatletter
+\newcommand*{\spl@}[1]{
+  \[ \begin{split} #1 \end{split} \] }
+\newenvironment{spl}
+  {\collect@body\spl@}
+  {}
+\makeatother
+\StopShownPreambleCommands
+\begin{document}
+\[
+  \begin{split}
+    4x+  6y -2z &= -4\\
+     x   -y +2z &= 9 \\[-1.4 ex]
+       \cline{1-2}
+    5x + 5y     &= 5 \\
+     x + y      &= 1 \\[-1.4 ex]
+\end{split}
+\]
+\begin{spl}% the new defined environment
+  4x+  6y -2z &= -4\\
+   x   -y +2z &= 9 \\[-1.4 ex]
+     \cline{1-2}
+  5x + 5y     &= 5 \\
+   x + y      &= 1 \\[-1.4 ex]
+\end{spl}
+\end{document}