Answer
$\begin{bmatrix}
-3 &6\\
-9 & 0
\end{bmatrix}$
Work Step by Step
$\begin{bmatrix}
6 & 3\\
-5 & 1
\end{bmatrix}-\begin{bmatrix}
9 & -3\\
4 & -1
\end{bmatrix}=\begin{bmatrix}
6-9 & 3-(-3)\\
(-5)-4 & 1-(-1)
\end{bmatrix}=\begin{bmatrix}
-3 &6\\
-9 & 0
\end{bmatrix}$
