Mathematics, 22.06.2019 03:00 kiki197701
Use matrices to solve this linear system: 5x1 − 2x2 = −30 2x1 − x2 = −13 x1 = x2 =
Answers: 2
and 
and 
![\left[\begin{array}{cc}5&-2\\2&-1\end{array}\right]\left[\begin{array}{c}x_1\\x_2\end{array}\right] =\left[\begin{array}{c}-30\\-13\end{array}\right]](/tpl/images/0002/5511/6f66b.png)
![\left[\begin{array}{cc}5&-2\\2&-1\end{array}\right]](/tpl/images/0002/5511/31198.png)
![\left[\begin{array}{c}x_1\\x_2\end{array}\right]](/tpl/images/0002/5511/ec771.png)
![\left[\begin{array}{c}-30\\-13\end{array}\right]](/tpl/images/0002/5511/9d75d.png)
both side, we get,
..............(1)
![\left[\begin{array}{c}x_1\\x_2\end{array}=\left[\begin{array}{cc}1&-2\\2&-5\end{array}\right]\left[\begin{array}{c}-30\\-13\end{array}\right]](/tpl/images/0002/5511/d586c.png)
![\left[\begin{array}{c}x_1\\x_2\end{array}\right]=\left[\begin{array}{c}-4\\5\end{array}\right]](/tpl/images/0002/5511/bf607.png)
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Use matrices to solve this linear system: 5x1 − 2x2 = −30 2x1 − x2 = −13 x1 = x2 =...
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