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10 October, 22:21

Find a solution to the system of equations by elimination

12x-9y=-15

-4x-8y=-28

+1
Answers (1)
  1. 11 October, 01:58
    0
    12x - 9y = - 15

    Let's divide both sides by 3.

    4x - 3y = - 5

    The other equation is

    -4x - 8y = - 28

    Adding equations,

    -11y = - 33

    y = 3

    4x = 3y - 5 = 3 (3) - 5 = 4

    x = 1

    Answer: x=1, y=3

    Check:

    12 (1) - 9 (3) = -15, good

    -4 (1) - 8 (3) = - 28, good
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