SOLUTION: slove the system by addition x+y=8,x-y=8 i come up with 0 can someone explained this to me please

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Question 389759: slove the system by addition
x+y=8,x-y=8
i come up with 0
can someone explained this to me please
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
adding the equations eliminates the y term ___ (x + y) + (x - y) = 8 + 8 ___ 2x = 16 ___ x = 8

substituting for x ___ (8) + y = 8 ___ y = 0 (as you already know)