Find the coordinate of point B of segment AB, if A (-3.6), and point C (1.4) is the midpoint of segment AB.

The midpoint of the segment AB on the plane with ends at points A (Xa; Ya) and B (Xb; Yb) has coordinates ((Xa + Xb) / 2; (Ya + Yb) / 2)

Substitute:

The coordinate of the midpoint of the segment X = 1

1 = (Xa + Xb) / 2

2 = -3 + Xb

Xb = 5

The coordinate of the midpoint of the segment Y = 4

4 = (Ya + Yb) / 2

8 = 6 + Yb

Yb = 2

Answer: Coordinates of point B (5; 2)