The distance(in units) between the points (1, 3), (5, 6) is:
The distance (in units) between the points (1, 3), (5, 6) is _____.
If X = -3 and Y = -4 are two perpendicular lines. Point P (-3, 1) lies on the line X = -3. Find the perpendicular distance(in units) from the point P to the line Y = -4.