The late fee for library books is $2.00 plus 15$ each day for a book that is late. If Maria's fee for a late book was $3.20, write and solve a linear equation to find many days late the book was.
Has to be in slope- intercept form (y=mx+b)

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?