Looking at the table, we can identify 4 ordered pairs.
(-1,-6),(2,-6),(5,-6),(8,-6)
Note that there is no change in y. We can choose any two points from the table and use the slope formula.
m=x2−x1y2−y1
We will substitute the points (-1,-6) and (2,-6) for (x1,y1) and (x2,y2), respectively, to find the slopem.