The equation for the given data is represented as y = 3x.
<h3>What is an equation?</h3>
The equation in mathematics is the relationship between the variables and the number and establishes the relationship between the two or more variables.
A graph is the representation of the data on the vertical and horizontal coordinates so we can see the trend of the data.
It is given that a parking garage at the airport charges $3 per hour, with a maximum charge of $15 per day.
The graph is attached with the answer in which y represents total cost and x represents the cost of parking per hour. The red line is the graph for y = 3x and the blue line is the graph for the cost of parking per day y =$15.
Therefore, the equation for the given data is represented as y = 3x.
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