Final answer:
Zoning ordinances are the legal method that a city uses to implement its general plan.
Step-by-step explanation:
The legal method that a city uses to implement its general plan is 1) Zoning ordinances. Zoning ordinances are regulations that divide a municipality into different districts, such as residential, commercial, and industrial, and establish rules for the use and development of properties within each district. These ordinances are put into effect to control and direct the development of land within a city's jurisdiction.