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17 November, 07:12

18x-16y=-312 78x-16y=408

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  1. 17 November, 09:13
    0
    Elimination

    multiply first equation by - 1 and add to 2nd

    -18x+16y=312

    78x-16y=408 +

    60x+0y=720

    60x=720

    divide both sides by 60

    x=12

    sub back

    18x-16y=-312

    18 (12) - 16y=-312

    216-16y=-312

    -16y=-528

    divide both sides by - 16

    y=33

    x=12

    y=33

    (x, y)

    (12,33)
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