7. A publisher asks a printer for quotations on the cost of printing 2,000 and 3,000 copies of book. The printer quotes $8,500 for 2,000 copies and $14,500 for 3,000 copies. Assume that cost, y linearly related to x, the number of books printed. a) Write the coordinates of given points. b) Write the equation of the line. c) What is the cost of printing 4,500 copies? is

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