Question
The co-ordinates of the mid-point C of a line segment AB are (-1, -2, 1). If the co-ordinates of point A are (2, 1, -3), find the co-ordinates of B.
Solution
Let the co-ordinates of the other end B be 
∴ co-ordinates of mid-point of line segment
AB are 
Hence, point B is (-4, -5, 5)
