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March 25, 2017

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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 - ,

    Start putting all the equations into the same form y = a*x + b

    A: -x+y=9; y =x + 9
    x-y=9; x = 9 + y; y =x-9
    These two are not the same

    B: -x+y=9; y = 9+x
    x-y= -9; x = -9+y; y = x+9
    These two are the same

    C: -x+y=9; y = 9+x
    -x-y=9; -y = 9+x; y = -x -9
    These two are not the same


    D: x-y= -9; x+9 = y
    -x+y= -9 ; y = x-9

    These two are not the same

    The correct answer is B

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