(Modeling) Solve problem.
Federal Debt The linear equation
y = 726.7x + 7421.6
gives an approximation of the total public debt y (in billions of dollars), where x = 0 corresponds to 2005, x = 1 corresponds to 2006, and so on. (Source: www. treasurydirect.gov)
(a) Write an equation that yields the same y-values when the exact year is entered.
(b) Predict the total public debt in 2012.
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