LaTeX Forum

\documentclass[a4paper, fleqn]{scrartcl}
\usepackage{amsmath}
\usepackage[ngerman]{babel}

\begin{document}

\begin{equation}
\left.
\begin{array}{cccc}
\textrm{a}) & y & = & c\\
\textrm{b}) & y & = & cx+d\\
\textrm{c}) & y & = & bx^{2}+cx+d\\
\textrm{d}) & y & = & ax^{3}+bx^{2}+cx+d
\end{array}
\right\} \textrm{Polynomes}
\end{equation}

\begin{align}
\textrm{a}) ~ y & = c\\
\textrm{b}) ~ y & = cx+d\\
\textrm{c}) ~ y & = bx^{2}+cx+d\\
\textrm{d}) ~ y & = ax^{3}+bx^{2}+cx+d
\end{align}

\end{document}

\documentclass[fleqn]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{empheq}

\begin{document}
  \begin{empheq}[right=\empheqrbrace\text{Polynomes}]{align}
    \text{a})\ y & = c \\
    \text{b})\ y & = cx+d \\
    \text{c})\ y & = bx^{2}+cx+d \\
    \text{d})\ y & = ax^{3}+bx^{2}+cx+d
  \end{empheq}
\end{document}