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

1. 👍 0
2. 👎 0
3. 👁 111
1. 4 - y = 10

1. 👍 0
2. 👎 0
posted by erkanni
2. -y=10-4=6

1. 👍 0
2. 👎 0
posted by mine

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