code: def line(p1, p2):
      
      A = (p1[1] - p2[1])
      B = (p2[0] - p1[0])
      C = (p1[0]*p2[1] - p2[0]*p1[1])
      return A, B, -C
docs: Creates a line from two points
  
      From http://stackoverflow.com/a/20679579
  
      Args:
          p1 ([float, float]): x and y coordinates
          p2 ([float, float]): x and y coordinates
      Returns:
          (float, float, float): x, y and _