SOLUTION: solve system by addition, then state Y value x+y=28 x-y=12

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Question 108081: solve system by addition, then state Y value
x+y=28
x-y=12
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=28
X-Y=12
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2X=40
X=40/2
X=20 ANSWER.
20+Y=28
Y=28-20
Y=8 ANSWER.
PROOF
20-8=12
12=12