Exercise 1 Page 48

Before we begin, let's create a table of values using the information from the exercise.

To know if the data given in the table represents a proportional relationship, let's first plot the points as (x,y) coordinate pairs.

Next, we will connect the points we graphed and extend the line to the y-axis. Recall that the graph of a proportional relationship is a single, straight line in the coordinate plane that passes through the origin.

As we can see, the line passes through the origin and is a straight line. Therefore, the cost is proportional to the number of tickets.