Minimizes the sum of the two distance, Mathematics

The value of y that minimizes the sum of the two distances from (3,5) to (1,y) and from (1,y) to (4,9) can be written as a/b where a and b are coprime positive integers. Find a+b.

Solution) The minimum distance of the points from (1,y) is the distance from the intersection of their perpendicular bisectors to the line x=1
hence slope of perpendicular bisector=> -4=2y-14 / 2x -7
                                                           => 8x + 2y = 42.

                                                         putting x=1,y=17,
                                                         hence a+b= 17 +1 =18 (ANS).

Posted Date: 3/29/2013 5:19:51 AM | Location : United States







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