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10 August, 14:42

8x+4y=-20 and - 4x-8y=-20 solve each system by substitution

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  1. 10 August, 15:01
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    8x + 4y = - 20

    4y = - 20 - 8x

    y = - 5 - 2x

    -4x - 8y = - 20

    -4x - 8 (-5-2x) = - 20

    -4x + 40 + 16x = - 20

    12x = - 60

    x = - 5

    8 (-5) + 4y = - 20

    -40 + 4y = - 20

    4y = 20

    y = 5
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