In order to find the rate at which truck consumes fuel, calculate the slope of the given graph, by using the following formula:
![m=(y_2-y_1)/(x_2-x_1)](https://img.qammunity.org/2023/formulas/mathematics/high-school/78uaqhwt0aws3qfwxigaftpihnmb1gzxtp.png)
where (x1,y1) and (x2,y2) are two points on the line.
Based on the given graph, you can select the points:
(x1,y1) = (0,500)
(x2,y2) = (500,200)
By replacing the previous values into the expression for m and simplifying you get:
![m=(200-500)/(500-0)=-(300)/(500)=-0.6](https://img.qammunity.org/2023/formulas/mathematics/college/oodx2mytj7m211e1r5rv7hpaup1spxfbn5.png)
The previous result means that the truck consumes its fuel at a rate of 0.6 liters/kilometer