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11 April, 20:02

18x - 16y = - 312

78x - 16y = 408

Answers (1)
  1. 11 April, 20:30
    0
    (-12,6)

    Step-by-step explanation:

    using elimination method multiply the second equation by - 1

    18x - 16y = - 312

    -78x + 16y = - 408

    add the two equations

    60x = - 720

    divide by 60

    x = - 12

    plug - 12 into the first equation

    18 (-12) - 16y = - 312

    -216 - 16y = - 312

    -16y = - 96

    y = 6
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