Confluence provides
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\begin{bmatrix} \dot x\\ \dot y\end{bmatrix} =
\begin{bmatrix}a_{1,1} & a_{1,2}\\ a_{2,1} & a_{2,2}\end{bmatrix}
\begin{bmatrix}x\\ y\end{bmatrix}
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The AMS Math packages are supported. To see how this was done, just click "Tools" (in the top right corner) then "View Wiki Markup."