segments Find the other endpoint of a segment with the endpo

segments

Find the other endpoint of a segment, with the endpoint (-1,9) and the midpoint (-9,-10).

The mid point of two point (x1, y1) and (x2, y2) is given by ((x1 + x2)/2 , (y1 + y2)/2)

Here we have the mid point as (-9, -10). Let the point to be determined be (x,y)

This gives us: (x - 1)/2 = -9 and (y + 9)/2 = -10

=> x = -18 + 1 = -17 and y = -20 - 9 = -29

The other point is (-17, -29)