Felix needs to find x and y in the following system:
Equation A: 7y - 4x = 5
Equation B: 3y + 4x = 25
If he wants to use the elimination method to eliminate one of the variables, which is the most efficient way for him to do so?
A. Add Equation A and Equation B
B. Subtract Equation B from Equation A
C. Multiply Equation A by 5.
D. Divide Equation B by -1.
