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%%  Ein Beispiel der DANTE-Edition
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%%  Beispiel 09-06-2 auf Seite 392.
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%%  Copyright (C) 2016 Herbert Voss
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{21}
\renewcommand\theequation{9.\arabic{equation}}
%StartShownPreambleCommands
\setlength\arraycolsep{1.4pt}
%StopShownPreambleCommands
\begin{document}
\begin{equation}
\left.
\begin{array}{r@{\hspace{.75em}}ccrr}
  \textrm{a}) & y & = & d              & \textrm{(konstant)}   \\[1pt]
  \textrm{b}) & y & = & cx+d           & \textrm{(linear)}     \\
  \textrm{c}) & y & = & bx^2+cx+d      & \textrm{(quadratisch)}\\
  \textrm{d}) & y & = & ax^3+bx^2+cx+d & \textrm{(kubisch)}
\end{array}
\right\} \textrm{Polynome}
\end{equation}
\end{document}