Answer
Jillian walks 0.5 blocks per minute.
Work Step by Step
The number of blocks per minute Jillian walks is also the slope of the graph.
Plot two points $(2,4)$ and $(4,3)$
Use the slope formula:
$m=\frac{y_2-y_1}{x_2-x_1}=\frac{3-4}{4-2}=-\frac{1}{2}$
Therefore, Jillian walks 0.5 blocks per minute.
