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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

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

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