$${\frac{\left(\begin{pmatrix}
{\mathtt{1}}
\\
-{\mathtt{2}}
\end{pmatrix}
{\mathtt{\,\small\textbf+\,}}\begin{pmatrix}
{\mathtt{5}}
\\
{\mathtt{9}}
\end{pmatrix}
\right)}{{\mathtt{2}}}} = \begin{pmatrix}
{\mathtt{3}}
\\
{\mathtt{3.5}}
\end{pmatrix}$$
.
