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%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 06-02-10 auf Seite 91.
%%  Copyright (C) 2018 Herbert Voss
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%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
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\begin{document}
\begin{align}
y      &= d              & z &= 1                    \\
y_{12} &= bx^2+cx+d      & z &= x^2+x+1     \nonumber\\
y(x)   &= ax^3+bx^2+cx+d & z &= x^3+x^2+x+1
\end{align}
\end{document}