SOLUTION: If x-y=81 and x+y=721 then what is the value of Y?

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Question 922697: If x-y=81 and x+y=721 then what is the value of Y?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Subtract the first equation from the second.
x%2By-x%2By=721-81
2y=640
y=320