How do I write the following word problem algebraically so that it can be solved in as a system of equations?
Dan is looking to secure a hard-copy textbook for an upcoming geology course that lasts six months. Dan is trying to decide between renting the text book and buying it. He can rent the textbook for $15 per month or purchase it outright for $105. Which option is the most advantageous for the student based upon the student's needs?
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Systems of equations is not needed to solve this.
Basically what you want to do is figure out which option is the cheapest...renting or buying. He could purchase the book for $105, or he could pay $15 per month for the book. If the course lasts for six months, how much, in total, would he pay if he choose to rent the book?