Posted by micheal on Tuesday, June 16, 2009 at 12:20am.
Those are two separate equations. You should have typed:
9x + 6y = 21
-9x + y = 35
You can either add them, or SUBSTITUTE y-35 for 9y in the first equation. Either way, you get
7y = 56
y = 8
9x + 48 = 21
x = -3
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