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17 October, 09:09

the value of two numbers if their sum is 12 and their difference is 4. write a system of equation and find the two numbers

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  1. 17 October, 10:49
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    x+y=12

    x-y=4

    Then you solve:

    x+y=12

    -y - y

    x=12-y

    x-y=4

    +y + y

    x=4+y

    4+y=12-y

    +y + y

    4+2y=12

    -4 - 4

    2y=8

    divide both sides by 2 to isolate y

    y=4

    Plug it into one of the equations

    x+4=12

    -4 - 4

    x=8
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