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If (x1, y1) and (x2, y2) are the end points of a line segment then the mid point is given by the formula ((x1+x2) /2, (y1 + y2) /2).

Here (x1, y1) = (-1, 9) and (x2, y2) = (7, - 25)

x1 = -1, x2 = 7, y1 = 9, y2 = -25

Mid point = ((x1 + x2) /2 , (y1+ y2) /2)

Mid point = ( (-1+7) / 2, (9 – 25)/2)

Mid point = (6/2, -16/2)

Mid point = (3, -8)

Hence the mid point of the given line segment AB is (3, -8)

Here x1 = 4 and y1 = 8 and mid point = (7, 3)

Mid point = ((x1 + x2) /2 , (y1 + y2) / 2)

(7, 3) = ((4 + x2) / 2, (8 + y2 )/ 2)

7 = (4 + x2) /2 3 = (8 + y2) / 2

Multiply with 2 on both sides Multiply with 2 on both sides

14 = 4 + x2 6 = 8 + y2

Add – 4 on both sides Add -8 on both sides

10 = x2 -2 = y2

Hence the other end of the line segment = (x2, y2) = (10, -2)