Problem:
Add the two matrices
$\left(
\begin{array}{cccc}
 -3 & -2 & -7 & -9 \\
 -4 & 9 & 1 & -2 \\
\end{array}
\right)$ and
$\left(
\begin{array}{cccc}
 -1 & -8 & 2 & 10 \\
 -4 & 7 & -8 & 6 \\
\end{array}
\right)$
Answer:
$\left(
\begin{array}{cccc}
 -4 & -10 & -5 & 1 \\
 -8 & 16 & -7 & 4 \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/add/27077.txt'}