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7 March, 12:03

X=-12-6y

-4x+5y=-39

slove by the system of substitution

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  1. 7 March, 12:06
    0
    X = - 6y - 12

    4x + 5y = - 39

    4x + 5y = - 39

    -4 (-6y - 12) + 5y = - 39

    -4 (-6y) + 4 (12) + 5y = - 39

    24y + 48 + 5y = - 39

    29y + 48 = - 39

    29y = - 87

    y = - 3

    x = - 6y - 12

    x = - 6 (-3) - 12

    x = 28 - 12

    x = 6

    (x, y) = (6, - 3)
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