Alaina wants to decide whether her current cell phone plan is better than a package that another company offers. To compare the two plans, she plotted two lines on a graph, where y represented the total cost of one month’s service and x represented the megabytes of data that she used in a month. Which part of the graph will represent the cost per megabyte of data used in each plan?

The x-intercepts of the two lines
The y-intercepts of the two lines.
The slopes of the two lines.
The coordinates of a point of intersection.