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9th grade math

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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

  • 9th grade math -

    what is 3(4x+6)+7x

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