The input of the function are the values of x which is also the number of rides on the horizontal axis.
The output of the function are the values of y which is also the dollars on card on the vertical axis. Thus, to find the output when the input is 10, we would find the value of y on the y axis corresponding to the value of x = 10 on the x axis. Looking at the graph,
when x = 10, y = 20
Thus, the output is 20
The coordinate pair is
(10, 20)