If and A(1, 2, -1) is the given point, find the coordinates of B.
A = (1,2,-1)
Let the co-ordinates of point B be (b1,b2,b3)
Comparing the respective co-efficient,
b1-1 = 2 i.e. b1 = 3
b2-2 = 1 i.e. b2 = 3
b3+1 = -3 i.e. b3 = -4
The required co-ordinates of B are (3,3,-4)