Posted by **Rose Mata** on Friday, January 26, 2007 at 11:15am.

The difference of two numbers is 7. The sum of the numbers is -1. What are the numbers?

I've come up with two equations:

x-y=7 and x+y=-1 but don't know what to figure it out from there since there are no numbers on the left side of the equation to work with.

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