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August 31, 2015

Homework Help: 9th grade math

Posted by anonymous on Wednesday, December 5, 2012 at 9:26pm.

Which of the linear systems has exactly one solution
A: -x+y=9
x-y=9

B: -x+y=9
x-y= -9

C: -x+y=9
-x-y=9

D: x-y= -9
-x+y= -9

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