Jimmy is buying party hats and balloons for his little sister’s birthday party. The party store charges $1.50 for each bag of balloons and $6 for each bag of hats. Write an equation that represents the different combinations of balloon bags and hat bags that he could buy with a total of $24. Let 'b' represent the number of balloon bags and 'h' represent the number of hat bags. The equation is $1.50b + h = 24$.