Many of the following problems can be modeled with a linear equation. Analyze them and identify what quantities the variables x and y represent. The information provided in the problems is adequate to determine a point and a slope or two points on the line.
In 1997, Angie paid $48 for a textbook for English 302. In 2008, her brother paid $92 for a textbook for the same course. Assume the price of a textbook increases linearly as a function of time since 1997. Write a linear equation that describes this relation.
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