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5 July, 16:20

The sum of two numbers is 15 and the difference is 19. What are the numbers?

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  1. 5 July, 16:31
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    X+y=47

    x-y=15

    add the equations

    2x=62

    x=31

    31+y=47

    y=16

    31 and 16 are the numbers

    also, ...

    x and 47-x are the numbers

    x - (47-x) = 15

    x-47+x=15

    2x-47=15

    2x=47+15

    2x=62

    x=31

    47-x=47-31=16

    if you are in a lower level course ...

    47/2=23.5

    use 23 and 24 to begin

    their sum is 47 but their difference is not 15

    23 and 24

    22 and 25

    21 and 26

    20 and 27

    19 and 28

    18 and 29

    17 and 30

    16 and 31 are the numbers
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