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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}
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