Before you get started, I would like to let you know that the distance formula isnt too bad. This formula is used to find the distance between two points on the horizontal and vertical line on the coordinate plane.

   First, plot these points (1,1) and (4,6)

 

   Second, try to draw a right triangle using the two points as two of the corners

 

   Now plug in your points (1,1) and (4,6) into this formula :

(X1,Y1) (X2,Y2)