Substitute -3x-8y=4 -2x+7y=15

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Substitute

-3x-8y=4
-2x+7y=15

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    2021-09-06T08:53:35+00:00

    -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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