Corey has $120 in savings and is planning to add $40 each week. Dana has $450 in savings and is planning to add $30 each week. Their plan is to wait until their savings are equal and then load up their old Volkswagen bus and take a road trip. They figure out that the equation used to determine how many weeks it will take until their savings are equal is 40w +120 30w+ 450, where w is the number of weeks they have been saving.