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Set up a linear system consisting of two equations. Assume you talk for a minimum 600 minutes. The first equation would be for the talks a lot company ($40 for 600 minutes and $.35 for each minute exceeding the 600) . The total cost (y) equals the base fee plus cost per minute times times the number of minutes exceeding 600. The second equation would be set up just like the first only you would use the Chat away company info ($50 for 600 minutes and $.10. For each minute exceeding )