4. X(-1, 2, 6) and Y(5, 5, 12) are two points in R.a). Determine the components of a position vector equivalent to YX.b). Determine the

4. X(-1, 2, 6) and Y(5, 5, 12) are two points in R³.a). Determine the components of a position vector equivalent to YX.b). Determine the components of a unit vector that is in the same direction as YX.