While surfing the Internet, you find a site that claims to offer "the most popular and the cheapest DVDs anywhere." Unfortunately, the website isn't clear about the how much they charge for each DVD, but it does give you the following information:
Number of DVDs Ordered 1 2 3
Total Cost (include S&H) $15 $24 $33
a. Plot the points and connect them to form a line.
b. What is the slope of the line containing the data points?
c. What does the slope represent in this problem?
d. What is the y-intercept of the line that contains the data points?