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Show that \( A B \neq B A \) in each of the following cases:
\[
A=\left[\begin{array}{rrr}
1 & 3 & -1 \\
2 & -1 & -1 \\
3 & 0 & -1
\end{array}\right] \text { and } B=\left[\begin{array}{ccc}
-2 & 3 & -1 \\
-1 & 2 & -1 \\
-6 & 9 & -4
\end{array}\right] \text {, }
\]
W)
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