![A=\left[\begin{array}{ccc}2&-3\\0&5\\7&-2\end{array}\right] ,\ B=\left[\begin{array}{ccc}1&0\\10&-\frac{1}{2}\\3&1\end{array}\right] \\\\A+B=\left[\begin{array}{ccc}2&-3\\0&5\\7&-2\end{array}\right]+\left[\begin{array}{ccc}1&0\\10&-\frac{1}{2}\\3&1\end{array}\right]\\\\A+B =\left[\begin{array}{ccc}2+1&-3+0\\0+10&5+\left(-\frac{1}{2}\right)\\7+3&-2+1\end{array}\right] \\\\A+B=\left[\begin{array}{ccc}3&-3\\10&4\frac{1}{2}\\10&-1\end{array}\right]](/tpl/images/0438/6597/b7dbc.png)
![3A=3\cdot\left[\begin{array}{ccc}2&-3\\0&5\\7&-2\end{array}\right]\\\\3A=\left[\begin{array}{ccc}3\cdot2&3\cdot(-3)\\3\cdot0&3\cdot5\\3\cdot7&3\cdot(-2)\end{array}\right]\\\\3A=\left[\begin{array}{ccc}6&-9\\0&15\\21&-6\end{array}\right]](/tpl/images/0438/6597/3e7c3.png)
Find a + b and 3a using the matrices
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