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16 August, 20:35

1. - 9x=16-y

12x=-5-y

+5
Answers (1)
  1. 17 August, 00:06
    0
    -9x=16-y equation 1

    12x=-5-y equation 2

    x=-5-y:12 from equation 2

    substitute this x in equation 2

    so

    -9 (-5-y:12) = 16-y

    15+3y=64-4y

    7y=49

    y=7

    and then substitute this value of y in equation (x=-5-y:12)

    so x = - 5-7:12

    x=-1

    so y=7 and x=-1
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