Answer
See answers below
Work Step by Step
According to the definition of a matrix:
$\begin{bmatrix}
-1& 2\\
3 &4
\end{bmatrix}$ is the coefficient matrix
$\begin{bmatrix}
x\\
y
\end{bmatrix}$ is the matrix of variables
$\begin{bmatrix}
4\\
-2
\end{bmatrix}$ is the matrix of constants
