SOLUTION: find two numbers whose sum is 22 and whose difference is 5?

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Question 81592: find two numbers whose sum is 22 and whose difference is 5?
Answer by checkley75(3666) About Me  (Show Source):
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X+Y=22, X=22-Y &
X-Y=5 NOW WE REPLACE X WITH (22-Y) & SOLVE FOR Y
22-Y-Y=5
22-2Y=5
-2Y=5-22
-2Y=-17
Y=-17/-2
Y=8.5 ANSWER.
X+8.5=22
X=22-8.5
X=13.5 ANSWER.
PROOF
13.5=8.5=22
22=22
13.5-8.5=5
5=5