Please answer both questions clearly thank you The distance

Please answer both questions clearly, thank you.

The distance d of a point P to the line through points A and B is the length of the component of Ap that is orhogonal to AB, as indicated in the diagram. orthogonal to AB, as indicated in the diagram. So the distance from P = (4.-2.-1) to the line through the points A = (0,-1.-4) and B = (-1 ,-5,0) is

Solution

4.652 (http://mathworld.wolfram.com/Point-LineDistance3-Dimensional.html)

4 (as the line is y = -1)