Question 330407
P(3,7);Q(6,16) 

slope of a line m = y2-y1/ x2-x1  for  points (x1,y1) & (x2,y2)

use the formula for the above points
16-7 / 6-3 
=9/3
=3

  and the other was P(5,17);Q(17,17)

17-17/ 17-5
=0