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14 June, 13:42

The sum of two numbers is 20. Their difference is 4. Write a system that describes this situation. Then solve your system by elimination to find the two numbers.

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  1. 14 June, 13:46
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    Call the two numbers x and y. The equations are straightforward; you can convert directly from English into math.

    "The sum of the two numbers is 20": x + y = 20

    "Their difference is 4": x - y = 4

    Now you can solve. Adding the equations you get 2x = 24, so x = 12. That means y = 8
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