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Which of the linear systems has exactly one solution?

-x + y = 9

x - y = 9

-x + y = 9, , x - y = 9,

-x + y = 9

x - y = -9

-x + y = 9, , x - y = -9,

-x + y = 9

-x - y = 9

-x + y = 9, , -x - y = 9,

x - y = -9

-x + y = -9