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September 17, 2014

September 17, 2014

Posted by **Cory** on Saturday, July 7, 2012 at 3:55pm.

The difference between two numbers is 3, and the sum of those two numbers is 21. What are the two numbers?

- algebra -
**Ms. Sue**, Saturday, July 7, 2012 at 4:00pmx - y = 3

x + y = 21

x = 3 + y

3 + y + y = 21

2y = 18

y = 9

x - 9 = 3

x = 12

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