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11 February, 16:40

The product of two integers is 72. one number is two less than 5 times the other

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  1. 11 February, 20:13
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    X*y=72

    x = 5y-2

    x=72/y

    72/y=5y-2

    72=5y^2-2y

    5y^2 - 2y - 72 = 0

    (5y+18) (y-4) = 0

    y = - 18/5 discard

    or y = 4

    4x=72

    x=18

    (18,4)
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