Which of the following would be the best first step when solving the following system using the substitution method?

Question

x - y = -4 ;
x + 2y = 5

a. x = -4 - y
b. x = -4 + y
c. 2y = 5 - x
d. 2y = 5 + x

Answer 1

add y to both sides of the top equation.

but
I would do it by elimination, subtract and x is gone.