%% %% Ein Beispiel der DANTE-Edition %% %% %% 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. %% %% %%Run also: >> << % Show page(s) 1 %% \documentclass[]{article} \pagestyle{empty} \setlength\textwidth{352.81416pt} \usepackage{amsmath,empheq,xcolor} \begin{document} \begin{empheq}[box=\fcolorbox{blue}{yellow!40}]{align} y &= d & z &= 1 \nonumber\\ y &= cx+d & z &= x+1 \\ y_{12} &= bx^{2}+cx+d & z &= x^{2}+x+1\nonumber \end{empheq} \end{document}