SOLUTION: Why would we divide by two in this problem, the sum of two numbers is 13. Their difference is 3. What are the numbers?
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Question 1100722: Why would we divide by two in this problem, the sum of two numbers is 13. Their difference is 3. What are the numbers? Found 2 solutions by ikleyn, richwmiller:Answer by ikleyn(52903) (Show Source):
The condition says
x + y = 13,
x - y = 3.
------------------- Add the two equations (both sides). "y" will cancel, and you will get
2x = 13 + 3,
which implies
x = = = 8.
THIS IS WHY WE DIVIDE BY 2.
