Problem:
Subtract the second matrix from the first:
$\left(
\begin{array}{ccc}
 -4 & 8 & 7 \\
 3 & -7 & -5 \\
 2 & 0 & 9 \\
 -7 & 1 & -9 \\
\end{array}
\right)$
$\left(
\begin{array}{ccc}
 10 & -2 & 4 \\
 -8 & -5 & 1 \\
 4 & -1 & 4 \\
 -2 & 2 & -7 \\
\end{array}
\right)$
Answer:
$\left(
\begin{array}{ccc}
 -14 & 10 & 3 \\
 11 & -2 & -6 \\
 -2 & 1 & 5 \\
 -5 & -1 & -2 \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/subtract/10274.txt'}