SOLUTION: How do I combine these two equations and solve to find the value of x and y? x+y=3 x-y=-9

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Question 369781: How do I combine these two equations and solve to find the value of x and y?
x+y=3
x-y=-9
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Do it like the others.