Answer:
a) 4 calories per minute
b) 0.25
Step-by-step explanation:
a) If you look at the line it intercepts the x and y axis at the origin (0,0). therefore if you take any point on the line you will see that the calories per minute are constant:
Look at point (40,10)
Calories per minute = x/y = 40/10 = 4
Look at point (80,20)
Calories per minute = x/y = 80/20 = 4
b) you can use any two points on the line. Lets use point 1 as (20,5) and point 2 as (60,15).
The slope of a straight line is defined as:
slope = (y2-y1)/(x2-x1) = (15-5)/(60-20) = 0.25
