SOLUTION: Solve the system by addition.
Algebra.Com
Question 71821: Solve the system by addition.
Answer by rcmcc(152) (Show Source): You can put this solution on YOUR website!
x + y = 1
x - y = 3
simply add all the terms
2x=4
x=2
substitute in 2 for x
2+y=1
y=-1
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