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19 July, 05:09

A first number plus twice a second number is 11. Twice the first number plus the second totals 31 find the numbers

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  1. 19 July, 07:34
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    X + 2y = 11

    2x + y = 31

    x = 11 - 2y

    2 (11 - 2y) + y = 31

    22 - 4y + y = 31

    3y = - 9

    y = - 3

    x = 11 - 2 (-3)

    x = 11 + 6

    x = 17
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