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29 November, 19:48

The sum of two numbers is 30 & their difference is 12.

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Answers (2)
  1. 29 November, 19:50
    0
    X+y=30

    x-y=12

    add them together

    x+y=30

    x-y=12+

    2x+0y=42

    2x=42

    divide 2

    x=21

    subsitute

    x+y=30

    21+y=30

    subtrat 21

    y=9

    number sare 21 and 9
  2. 29 November, 20:02
    0
    The answer is 21 and 9. You can use guess and check to solve this. If you add 21 and 9, the sum is 30, and if you subtract 9 from 21, the difference is 12.
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