[tex]a)\\\\\begin{pmatrix}6&-7\\ 0&5\end{pmatrix}+\begin{pmatrix}-2&6\\ 3&-3\end{pmatrix}\\\\=\begin{pmatrix}6+\left(-2\right)&\left(-7\right)+6\\ 0+3&5+\left(-3\right)\end{pmatrix}\\\\=\begin{pmatrix}4&-1\\ 3&2\end{pmatrix}[/tex]
[tex]b)\\\\\begin{pmatrix}6&-7\\ 0&5\end{pmatrix}+\begin{pmatrix}2&-1\\ 3&5\end{pmatrix}\\\\=\begin{pmatrix}6+2&\left(-7\right)+\left(-1\right)\\ 0+3&5+5\end{pmatrix}\\\\=\begin{pmatrix}8&-8\\ 3&10\end{pmatrix}[/tex]
[tex]c)\\\\\begin{pmatrix}-2&6\\ 3&-3\end{pmatrix}+\begin{pmatrix}2&-1\\ 3&5\end{pmatrix}\\\\=\begin{pmatrix}\left(-2\right)+2&6+\left(-1\right)\\ 3+3&\left(-3\right)+5\end{pmatrix}\\\\=\begin{pmatrix}0&5\\ 6&2\end{pmatrix}[/tex]
