SOLUTION: David is thinking of two numbers. Their sum is 5. Their difference is 349. What are the two numbers?

Question 1131090: David is thinking of two numbers. Their sum is 5. Their difference is 349. What are the two numbers?
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
1) x + y = 5
:
2) x - y = 349
:
add equations 1 and 2 together
:
2x = 354
:
x = 177
:
substitute for x in equation 1
:
177 + y = 5
:
y = -172
:
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the two numbers are 177, -172
:
check the answer using equation 2
:
177 -(-172) = 349
:
177 + 172 = 349
:
349 = 349
:
answer ok
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