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28 June, 05:19

A first number plus twice a second number is 5. Twice the first number plus the second totals 19. Find the numbers

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  1. 28 June, 08:37
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    A first number plus twice a second number is 5,

    This would be x + 2y = 5

    Twice the first number plus the second totals 19.

    This would be 2x + y = 19

    x - x + 2y = 5 - x

    2y = 5 - x

    2y/2 = 2.5 - 1/2x or y = 2.5 - 0.5x

    You cant find the value of the numbers if 2 out of 3 of the numbers are missing.
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