On 2013–08–22 Xan wrote:

> Simple question: what is the equivalent of:
> 
> \begin{equation*}
> \left\{ \begin{aligned}
> 2x - 2y = 0\\
> 4x - 2y = 2
> \end{aligned} \right.
> \end{equation*}
> 
> in ConTeXt?

\starttext
  \startformula
    \startcases
      \NC 2x - 2y = 0 \NR
      \NC 4x - 2y = 2 \NR
    \stopcases
  \stopformula
\stoptext

See http://dl.contextgarden.net/myway/mathalign.pdf

Marco