Question

chau is walking. the number of calories he has burned varies directly with the number of minutes he has walked. see the graph below.
(a) how many calories is chau burning per minute?
2 calorie(s)
(b) what is the slope of the graph?
2

Explanation:

Step1: Find calories per minute

Pick a point, e.g., (10,20). Calculate $\frac{20}{10}=2$

Step2: Calculate slope of the graph

Slope = $\frac{\text{Change in } y}{\text{Change in } x}$. Use (0,0) and (10,20): $\frac{20-0}{10-0}=2$

Answer:

(a) 2 calorie(s)
(b) 2