The price for one person is $ 49. For every extra person, Audrianna lowers the price by $ 2. Thus, it is necessary to create a function where cost (C) will vary according to the variation in the number of people (N).
For more than one person, we must put variable C as a function of the variation in the number of people. However, we want to find the price. To find the price for each extra person, simply decrease the one-person value ($ 49) of the discount ($ 2) multiplied by the total number of people (N).
Thus, we have the following function: C = 49 - 2(N)
For one more person: C = 49 - 2 (1) = $ 47
For two more people: C = 49 -2 (2) = $ 45
(...)
For nineteen more people: C = 49 -2 (19) = $ 11
So if nineteen people participate in the tour, the cost for each person will be $ 11.
