The Figure Represents the Average Credit Card Debt for Selected

Essay

The figure represents the average credit card debt for selected households in Silerville. Let y represent the credit card debt in dollars. Let x represent the year, where x = 0 corresponds to the year 1990, x = 4 represents 1994, and so on.
a. Use the ordered pairs given in the graph, (0, 3299) and (16, 7415) to find a linear equation to estimate the average credit card debt versus the year. Round the slope to the nearest tenth.
b. Use the model from (a) to estimate the average debt in 2003. Round to the nearest dollar.
c. Interpret the slope of the model in the context of this problem.