Question 270496: Please explain this linear equation:
If x + y = 15 and x -y = -19 then xy = ?
Thanks,
Jesse Evans
jesseevans@hughes.net Found 2 solutions by papugai, Alan3354:Answer by papugai(18) (Show Source):
You can put this solution on YOUR website! If x + y = 15 and x -y = -19 then xy = ?
Add the two equations:
2x=-4
x=-2
sub into first equation:
-2+y=15
y=17
xy=-2*17=-34
Hope this was helpful
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