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30 March, 04:07

Solving system of equation using substitution?

-3x - 8y = 20

-5x + y = 19

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Answers (1)
  1. 30 March, 04:24
    0
    Multiple second equation by 8

    -3x-8y=20

    -40x+8y=152

    sum 2 equations:

    -43x+0=172

    x=172/-43

    x=-4

    put x in one of the equations

    -3*-4-8y=20

    12-8y=20

    -8y=20-12

    -8y=8

    y=-1
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