Answer
$\left[\begin{array}{rrrr}
1 & 1 & -1 & 1\\
1 & 0 & 2 & -3\\
0 & 2 & -1 & 3
\end{array}\right]$
Work Step by Step
Three equations, three rows.
Each row contains the coefficients of the variables (LHS),
followed by the constant of the RHS:
$\left[\begin{array}{rrrr}
1 & 1 & -1 & 1\\
1 & 0 & 2 & -3\\
0 & 2 & -1 & 3
\end{array}\right]$
