Why not use `eqnarray`?

The environment eqnarray is attractive for the occasional user of mathematics in LaTeX documents: it seems to allow aligned systems of equations. Indeed it does supply such things, but it makes a serious mess of spacing. In the system:

snippet.latex
\begin{eqnarray}
a & = & b + c \\
x & = & y - z
\end{eqnarray}

the spacing around the “=” signs is not that defined in the metrics for the font from which the glyph comes - it's \arraycolsep, which may be set to some very odd value for reasons associated with real arrays elsewhere in the document.

The user is far better served by the amsmath bundle, which provides an align environment, which is designed with the needs of mathematicians in mind (as opposed to the convenience of LaTeX programmers). For this simple case (align and other amsmath alignment environments are capable of far greater things), code as:

snippet.latex
\begin{align}
a & = b + c \\
x & = y - z
\end{align}

The matter is discussed in more detail in a PracTeX journal paper by Lars Madsen; Stefan Kottwitz offers a TeX blog entry which includes screen shots of the output, convincingly demonstrating the problem.

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