$$\left[ \begin{array} { l } { 3 } & { 4 } \\ { - 1 } & { - 2 } \end{array} \right] \left[ \begin{array} { l } { - 1 } \\ { 2 } \end{array} \right]$$
$\left(\begin{matrix}5\\-3\end{matrix}\right)$
$$\left(\begin{matrix}3&4\\-1&-2\end{matrix}\right)\left(\begin{matrix}-1\\2\end{matrix}\right)$$
$$\left(\begin{matrix}3\left(-1\right)+4\times 2\\\end{matrix}\right)$$
$$\left(\begin{matrix}3\left(-1\right)+4\times 2\\-\left(-1\right)-2\times 2\end{matrix}\right)$$
$$\left(\begin{matrix}-3+8\\1-4\end{matrix}\right)$$
$$\left(\begin{matrix}5\\-3\end{matrix}\right)$$
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$\left(\begin{matrix}5&-3\end{matrix}\right)$
