The co-ordinates of the point which divides the join of the points (2, –1, 3) and (4, 3, 1) in the ratio 3 : 4 internally are given by
27,207,107
157,207,37
107,157,27
207,57,157
From x=m1x2+m2x1m1+m2,y=m1y2+m2y1m1+m2,z=m1z2+m2z1m1+m2; x=207,y=57,z=157.
The co-ordinates of the point which divides (internally) the line joining the points (– 2, – 2) and (– 5, 7) in the ratio 2 : 1 are