The table shows the gross income tax collections (in billions of dollars) by the Internal Revenue Service for individuals x and businesses y for selected years.

(a) Use the regression capabilities of a graphing utility to find the least squares regression line for the data.

(b) Use the model to estimate the business income taxes collected when the individual income taxes collected is $1300 billion.

(c) In 1975, the individual income taxes collected was $156 billion and the business income taxes collected was $46 billion. Describe how including this information would affect the model.

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1980 Individual, x 288 Business, y 72 Year Year Individual, x Business, y 1985 1990 1995 397 540 676 77 174 110 2010 2015 1760 390 2000 2005 1137 1108 1164 236 307 278