Chapter 4.2, Problem 21E

Find the coefficient of the straight line equation (a and b) in the equation Y = aX + b from the following data (in the table)

Let A be the point with coordinates (-3, 2, -1) and let B be the point with coordinates (2, 0, 0). Let / be the line passing through the origin and B. Let D be the midpoint of AB. What is the distance from D to the line l?

Find the points that touch the x axis of curve v=u2+pu+(n+1) where n=516. Also find the equation of lines at that points give geometrical representation.