9th grade math

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

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  3. 👁 86
  1. find a system where the slopes are different. ANy two lines with different slopes intersect at exactly one point.

    Looks like (C)

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    2. 👎 0
    posted by Steve
  2. |1.5C-24|<=30

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    2. 👎 0
    posted by DESIREE

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