If the system of equations
\begin{aligned}
& p x+q y=8 \\
& 3 x-q y=38
\end{aligned}
has the solution (x,y)=(2,-4), then p is equal to
Answer Choices
A. -12
B. 20
C. 8
D. 40
E. 21.5
If the system of equations
has the solution (x,y)=(2,-4), then p is equal to
Answer Choices
A. -12
B. 20
C. 8
D. 40
E. 21.5