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

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

- 9th grade math -
**Jennifer**, Friday, December 7, 2012 at 4:59pmStart putting all the equations into the same form y = a*x + b

A: -x+y=9; y =x + 9

x-y=9; x = 9 + y; y =x-9

These two are not the same

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

x-y= -9; x = -9+y; y = x+9

These two are the same

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

-x-y=9; -y = 9+x; y = -x -9

These two are not the same

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

-x+y= -9 ; y = x-9

These two are not the same

The correct answer is B

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