Math

6x-4y=54
-9x+2y=-69

Which system would work best to solve?

Please show work and solve. (all steps)

Thank You

I honestly don't know how to do this.

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asked by Deborah
  1. I would use elimination, where we attempt to get the coefficients of either x or y to be the same or to be opposite

    1st equation --> 6x - 4y = 54
    2nd times 2 --> -18x + 4y = -138
    add them:
    -12x = -84
    divide by -12
    x = 7

    sub back into the first
    6(7) - 4y = 54
    -4y = 12
    y = -3

    x = 7, y = -3

    sub those values into both equations to verify that my answer is correct (it works !)

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    posted by Reiny
  2. Thank you very much....

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    posted by Deborah
  3. x + 4y = 54

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