standard_description: Multiply matrices by scalars to produce new matrices, e.g., as when all of the payoffs in a game are doubled.
problem_activity: For the following system, determine the values of
$${p, q,}$$
and
$$r$$
that satisfy all three equations:
$$2p + q - r =8$$
$$q + r = 4$$
$${p- q =2}$$


aligns: no