math

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5x+5y=-11
7x-3y=19

I am told that my answer is
wrong, can you help me
(1.24, -3.44)

  • math -

    Whoever told you that you were wrong, copy this and show them

    if x=1.24, y=-3.44

    equation#1
    LS = 5(1.24) + 5(-3.44)
    = 6.2 - 17.2
    = -11
    = RS

    equation #2
    LS = 7(1.24) - 3(-3.44)
    = 8.68 + 10.32
    = 19
    = RS

    Trust yourself !!

  • math -

    Multiply both sides of the the last equation by 5/3, to give
    11.667 x - 5y = 31.667
    Add that to the first equation and you get
    16.667x = 20.667
    x = 1.24
    y = (7x-19)/3 = -3.44

    If that was your answer, rounded off to three significant figures, then you are correct.

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