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27 September, 03:30

What two number multiplied equal 12 but also added together equal - 7

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  1. 27 September, 03:52
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    A) x * y = 12

    B) x + y = - 7

    A) x = 12 / y

    Substitute this into B

    B) 12/y + y = - 7

    multiplying both sides by "y"

    12 + y^2 = - 7y

    y^2 + 7y + 12 = 0

    y = - 4

    and from equation B we calculate x as - 3
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