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26 October, 16:15

Find two numbers whosse sum is 12 and whose difference is 4

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  1. 26 October, 16:43
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    X + y = 12

    x - y = 4

    From the second equation we can see that x = 4 + y

    We can plug this into the first one and get:

    4 + y + y = 12

    4 + 2y = 12

    2y = 12-4

    2y = 8

    y = 4

    And then we can plug that into "x" and get that x = 4 + 4, or x=8
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