[OS X TeX] Inline system of equations

[Franck Pastor]

Le 30-juin-08 à 16:45, Randy Scott a écrit :

> Good Morning!
>
> I'm trying to create a system of equations, with a left brace,  
> aligned at
> the = symbol, to use in an enumerate environment. I want the base  
> line of
> the system to be on the same line with the enumerate label.
>
> In my reading (More Math into Latex, on the 'net), I've only found  
> aligned
> systems presented as display.
>
> Could any of you point me in the right direction?
>
> Thanks very much,
>
> Randy Scott
> Santiago Canyon College

I don't exactly understand what you mean by "the base line of the  
system" (the middle of the brace?), but here is a try:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
A system:
$\left\lbrace
	\begin{aligned}
		x + y &= 2\\
		x + 2y &= -1
	\end{aligned}
\right.$
\end{document}

HTH,

Franck Pastor