SOLUTION: the sum of two numbers is 18. thier difference is 22. what are the numbers?

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Question 196398: the sum of two numbers is 18. thier difference is 22. what are the numbers?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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the sum of two numbers is 18. their difference is 22. what are the numbers?
:
x + y = 18
x - y = 22
-------------addition eliminates y, find x
2x = 40
x = 20
:
Find y:
20 + y = 18
y = 18 - 20
y = -2
;
:
Check solution in 2nd equation:
20 -(-2) = 22