How is the leader of the city chosen? Given the previous question, write a context that contains the answer. It can be 1 - 20 sentences. Context:
The city is governed pursuant to the Home Rule Charter of the City of Detroit. The city government is run by a mayor and a nine-member city council and clerk elected on an at-large nonpartisan ballot. Since voters approved the city's charter in 1974, Detroit has had a "strong mayoral" system, with the mayor approving departmental appointments. The council approves budgets but the mayor is not obligated to adhere to any earmarking. City ordinances and substantially large contracts must be approved by the council. The Detroit City Code is the codification of Detroit's local ordinances.