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This question already has an answer here:

How to write an equation involving matrices in latex?

Say a 2x2 matix multiplied by a 2x1 matrix equals to a 2x1 matrix.

marked as duplicate by percusse, Stefan Pinnow, Schweinebacke, Troy, Andrew Swann Oct 27 '17 at 11:07

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\begin{matrix}
\begin{pmatrix}a&b\\c&d\end{pmatrix}&\begin{pmatrix}\eta_1\\\eta_2\end{pmatrix}=\begin{pmatrix}m\\n\end{pmatrix}
\end{matrix}

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