Answer:
-4
Step-by-step explanation:
The slope is usually a function of the differences in y divided by the differences in x, and it can be described in the following equation,
(1)
We can select any of the two points to be our first point, let's say, J(1,-4) is point 1, so J (x1,y1). In other words, 
and by the same way, for K(-2,8). Therefore, 
. By substituting these values in equation 1, we can deduce the following
132 because 11 times 4 times 3 is 132. Forget the 5 because the 11 and 5 is measuring basically the same thing.
Add them all together the divide what you get by 5
Go to a math calculator and type this in then press graph and it will give you your answer
