Answer: -1
Step-by-step explanation:
Given: The set of points W(4, 4), X(6, 2), Y(-8, 16) are collinear
The slope of a line passing through points (a,b) and (c,d) is given by :-

Now, the slope of line passing through W(4, 4), X(6, 2) is given by :-

Hence, the slope of line passing through W(4, 4), X(6, 2), Y(-8, 16) =-1