Grayson is deciding between two parking garages. Garage A charges an initial fee of $8 to park plus $1.50 per hour. Garage B charges an initial fee of $4 to park plus $2.50 per hour. Let A represent the amount Garage A would charge if Grayson parks for t hours, and let B represent the amount Garage B would charge if Grayson parks for t hours. Graph each function and determine which garage would be cheaper if Grayson needs to park for 6 hours.