Find the slope of the line that passes through the pair of points (–1, –10) and (–3, 10).

To find the slope of a line you only need two points. The first point is (x1,y1) and the second point is (x2,y2). The slope m is (y2-y1)/(x2-x1) = (10--10)/(-3--1)
= 20/ -2 = -10.
m = -10.

M = (y₂ - y₁)/(x₂ - x₁)
m = (10 + 10)/(-3+1)
m = 20/-2
m = -10

the slope of the line is -10

P(chicago, illinois)