![\left[\begin{array}{ccc}5&7\\5&-8\\3&-9\end{array}\right] \left[\begin{array}{ccc}c\\d\end{array}\right] =\left[\begin{array}{ccc}-16\\3\\-15\end{array}\right]](/tpl/images/0259/5958/bb0db.png)
![A=\left[\begin{array}{ccc}5&7\\5&-8\\3&-9\end{array}\right]](/tpl/images/0259/5958/ee1e1.png)
![b=\left[\begin{array}{ccc}-16\\3\\-15\end{array}\right]](/tpl/images/0259/5958/727e1.png)
![c\left[\begin{array}{ccc}5\\5\\ 3\end{array}\right]+d\left[\begin{array}{ccc}7\\-8\\-9\end{array}\right]=\left[\begin{array}{ccc}-16\\3\\-15\end{array}\right]](/tpl/images/0259/5958/28dbf.png)
.![\left[\begin{array}{ccc}c\\d\end{array}\right]](/tpl/images/0259/5958/816ef.png)
.:linear algebra problem. (linear combinations)
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