Answer:
x = 4, y = 0.
As an ordered pair it is (4, 0).
Step-by-step explanation:
Rewriting the second equation as the same format as the first:
y + x = 4
y - 2x = - 8 Subtract (1) - (2):
0 + 3x = 12
x = 4.
Plug x = 4 into the first equation:
y + 4 = 4
y = 0.
Check in the second equation:
y = 0 = 2(4) - 8 = 8 -8 = 0. OK.
