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15 March, 17:48

Three times the lager of two numbers is equal to four times the smaller. the sum if the numbers is 21. find the number

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  1. 15 March, 21:12
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    3x = 4y

    X+y = 21

    Multiply second equation by 3

    3x+3y = 63

    Substitute 3x with 4y

    4y + y = 21

    5y = 21

    Y=4.2

    X + 4.2 = 21

    x = 16.8
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