Watch the video and then solve the problem given below.
Click here to watch the video.
Solve the system by the substitution method.
$7x + 8y = -49$
$5x - y = 12$
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. The solution set is $\boxed{}$ (Type an ordered pair.)
B. There are infinitely many solutions.
C. There is no solution.