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25 November, 17:54

A first number plus twice a second number is 24. twice the first number plus the second totals 21. find the numbers.

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  1. 25 November, 20:39
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    We do like the following:

    Set the first number is a and the second is b.

    We have two equations: a+2xb=24, 2xa+b=21

    And we have 2xa+4xb=48 or 2xa=48-4xb

    So: 48-4xb+b=21 or - 3xb=21-48=-27 and we got b=-27: (-3) = 9 and a = 6

    a=6 and b=9
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