Question 247375
Find the slope,if it exists, of the line containing the pair of points, (-10,-6) and (-16,-18) 

The slope m of the line between two points (x1,y1) and (x2,y2) is defined as:

m = (y1-y2)/(x1-x2)

In this case we have:

m = (-6-(-18))/(-10-(-16))
m = (-6+18)/(-10+16)
m = 12/6 = 2