document.write( "Question 922697: If x-y=81 and x+y=721 then what is the value of Y? \n" ); document.write( "
Algebra.Com's Answer #559927 by Fombitz(32388)\"\" \"About 
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Subtract the first equation from the second.
\n" ); document.write( "\"x%2By-x%2By=721-81\"
\n" ); document.write( "\"2y=640\"
\n" ); document.write( "\"y=320\"
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