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?

Question

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?

hero · Answer

Systems of equations is not needed to solve this.

hero · Answer

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?