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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 ?

 Oct 2, 2021
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x+y =25         y = 25 -x

 

x-y = 18    sub in for y

x -(25-x) = 18

2x = 43

x = 21.5

y = 3.5           21.5 *3.5 = _________

 Oct 2, 2021

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