Answer
See explanation
Work Step by Step
$\left[\begin{array}{cc}1 & -1 \\ -2 & 1 \\ 1 & 0\end{array}\right]\left[\begin{array}{c}x_{1} \\ x_{2}\end{array}\right]=\left[\begin{array}{c}x_{1}-x_{2} \\ -2 x_{1}+x_{2} \\ x_{1}\end{array}\right]$
By inspection