SOLUTION: Solve the system by addition. x + y = 9 x – y = 9

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Question 108313: Solve the system by addition.
x + y = 9
x – y = 9
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=9
x–y=9
------
2x=18
.
2x/2=18/2
x=9
y=0
.
Ed