Exercise 39 Page 350

Observing the given graph, we can see that the line passes through the points $(\text{-}5,2)$ and $(3,\text{-}1).$ One way to use a graph to find the slope of a line is to count the change in $x$ and $y.$

We can tell from the given graph that the $\text{rise}$, or change in $y$ from left to right, is $\text{-}3.$ We can also see that the $\text{run}$, or change in $x$ from left to right, is $8.$