Sections 4 and 5 discuss the operation of cities based on population. Section 4 states that a city with a population of 5,000 or fewer has only those powers granted to it by general law; Section 5 permits a city, once its population exceeds 5,000, to adopt a charter under home rule provided the charter is not inconsistent with limits placed by the Texas Constitution or general law (the city may amend to maintain home rule status even if its population subsequently falls to 5,000 or fewer).