\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A triangle has an area of 5 square units. It is transformed by the matrix \(\mathbf{B} = \begin{pmatrix} 2 & 0 \\ 1 & 3 \end{pmatrix}\).
Find the area of the image of the triangle.
\(\text{Area}(S')=\)
square units