Problem:
Multiply the scalar $\frac{15}{7}$ and the matrix
$\left(
\begin{array}{cc}
 4 & -9 \\
 1 & 9 \\
\end{array}
\right)$.
Answer:
$\left(
\begin{array}{cc}
 \frac{60}{7} & -\frac{135}{7} \\
 \frac{15}{7} & \frac{135}{7} \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/multiply_by_scalar/44610.txt'}