Question: A large Midwestern retailer has developed a graph that summarizes the effect of advertising expenditures on sales volume. Using the graph, determine an equation of
A large Midwestern retailer has developed a graph that summarizes the effect of advertising expenditures on sales volume. Using the graph, determine an equation of the form y = a + bx that describes this relationship.

Sales ($ millions) 3 2 1 2 4 6 8 Advertising ($ thousands) 10 X-
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