Exercise 1 Page 209

We have been asked to interpret the x-intercept of the graph. If we look at the line itself, we see that the quantity of water in the tub is decreasing over time. The x-intercept ( 8, 0) shows us that after 8 minutes, there are 0 gallons of water in the bathtub. x= 8& → 8minutes have passed y= 0& → 0gallons of water are left

Therefore, the x-intercept shows how long it takes for the bathtub to drain. This corresponds to option A.