The total cost for a group visiting a zoo is represented by the proportional equation y = 15 · x, whose graph is shown in the image attached below.
In this question we have an application for an specific type of linear equations known as proportional equations, where the total cost for visiting the zoo (y), in US dollars, is directly proportional to number of persons visiting the zoo (x), whose expression is shown below:
y = k · x (1)
Where k is the constant of proportionality, in dollars per person.
Then, if we know that k = 15 USD, then the equation and the graph of the total cost as a function of the number of persons visiting the zoo is:
y = 15 · x (2)
Please notice the graph is in the image attached below.
To learn more on proportional equations: https://brainly.com/question/11897796
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