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7 September, 03:07

4) The sum of two numbers is 39. Their

difference is 21. What are the two numbers?

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Answers (1)
  1. 7 September, 05:11
    0
    30 and 9

    Step-by-step explanation:

    x+y=39, x-y=21

    Solve for x:

    x+y=39, x-y=21

    x = 30

    Substitute x with 30:

    (30) + y=39, (30) - y=21

    Solve for y:

    y=9
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