Answer
$$\begin{bmatrix}
1&-1&2&\vdots&2 \\4&-3&1&\vdots &-1 \\2&1&0&\vdots &0
\end{bmatrix}$$
Work Step by Step
In order to write a matrix that would solve this linear equation, we write the coefficients of each variable in their own column. Doing this, we find:
$$\begin{bmatrix}
1&-1&2&\vdots&2 \\4&-3&1&\vdots &-1 \\2&1&0&\vdots &0
\end{bmatrix}$$
