Consider the line y=10 x -1 and the point P=(2,0). (a) Write the formula for a function d(x) that describes the distance between the point P and a point (x,y) on the line. You final answer should only involve the variable x. Then d(x) = |:| X (c) The critical number is x: |:| . (d) The closest point on the line to P is (|:| , |:| ). X X