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Is the relationship shown in the graph at right proportional? If so, use it to complete a Proportions Web. If not, explain why it is not.  

First quadrant graph, x axis labeled, Number of Books Purchased, y axis labeled, Cost in dollars with an increasing line, going through the Points (1, comma 10), (2, comma 14), (3, comma 18), (4, comma 22), and (5, comma 26).

Does the graph go through ? If not, then the relationship is not proportional.