SOLUTION: The sum of two numbers is 39 and their difference is 7. What are the numbers?

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Question 115261:
The sum of two numbers is 39 and their difference is 7. What are the numbers?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=39 OR X=39-Y
X-Y=7
NOW REPLACE X BY (39-Y) IN THE SECOND EQUATION & SOLVE FOR Y.
39-Y-Y=7
-2Y=7-39
-2Y=-32
Y=-32/-2
Y=16 ANSWER.
X+16=39
X=39-16
X=23 ANSWER.
PROOF
23-16=7
7=7