Remember slope is [tex]\dfrac{rise}{run}[/tex]. In the graph we can just pick two points on the line to find the rise and run between. Let's say we choose (0,3) and (1,7). Between those points there is 7-3=4 rise and 1-0=1 run. So the slope is [tex]\dfrac{4}{1}=\boxed{4}[/tex]
