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?
Answer
A
The x-intercepts of the two lines
B
The y-intercepts of the two lines.
C
The slopes of the two lines.
D
The coordinates of a point of intersection.
Explanation
The graph shows total monthly cost, y, in relation to data used, x. The slope measures the change in cost divided by the change in data, so its units are cost per megabyte. Therefore, the slopes of the two lines represent each plan’s cost per megabyte of data used.
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