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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