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4 July, 20:41

Substitute

-3x-8y=4

-2x+7y=15

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Answers (1)
  1. 4 July, 23:28
    0
    -2x=15-7y

    x=-7.5+3.5y

    -3x-8y=4

    -3 (7.5+3.5y) - 8y=4

    -22.5-10.5y-8y=4

    -22.5-18.5y=4

    -18.5y=4+22.5

    -18.5y=26.5

    y=-53/35

    the fraction might not be in lowest terms.
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