SOLUTION: Solve the following system of equations: x+y=3 x-y=9

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Question 173439: Solve the following system of equations:
x+y=3
x-y=9
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the following system of equations:
x+y=3
x-y=9
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There are several ways to do these, but the quickest and simplest for this pair is to add the 2 eqns.
x+y=3
x-y=9
2x = 12
x = 6
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y = -3