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The sum of the real numbers x and y is 25. Their difference is 18. What is the value of xy ?

 Aug 7, 2021
 #1
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x + y = 25 

and 

x - y = 18

Use elimination 

2y = 7

y = 3.5

x = 21.5

xy = 21.5*3.5 = 75.25 or as a mixed number, 75 and 1/4.

 Aug 7, 2021

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