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