When Lisa started at her current job, her employer gave her two days of paid vacation time with a promise of three additional paid vaca- tion days for each year she remains with the company to a maxi- mum of four work weeks of paid vacation time. a. Let x represent the number of years she has worked for this employer and y represent the number of paid vacation days she has earned. Write an equation that models the relationship between these two variables. b. It has been fi ve years since Lisa began working for this employer. How many paid vacation days has she earned? c. When will she reach the maximum number of paid vacation days allowed?