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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
Sagot :
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