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# Let $C = (3, 5)$ be the midpoint of $AB,$ where $A = (1, 8)$ and $B = (x, y).$ What is the value of $xy$?

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Let $C = (3, 5)$ be the midpoint of $AB,$ where $A = (1, 8)$ and $B = (x, y).$ What is the value of $xy$?

Aug 20, 2021

#1
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From the midpoint formula, B = (2,13/2) so xy = 2*13/2 = 13.

Aug 20, 2021
#3
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dont think ur answer is correct....

Guest Aug 21, 2021
#2
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Using midpoint formula, $$({{x + 1} \over 2}, {{y + 1} \over 2}) = (3, 5)$$, so x = 5 and y = 9, so xy = 45

Aug 21, 2021
#4
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B = (5, 2)

Aug 21, 2021
#5
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xy = 10

Guest Aug 21, 2021