As of 2005, the United States had no guidelines on suggested caffeine intake for children and teenagers, but Canada did. On average, the recommended daily intake can be modeled by the equation my +24 1.3x, where we think of my as being the average maximum amount of caffeine in milligrams that is safely consumed per day by a child or teenager who weighs x pounds.
a. If one teenager weighs 10 pounds more than another, on average how many more milligrams of caffeine can he or she safely consume per day?
b. How should the slope for this model be denoted: b1 or b1?