Tenn. Code Ann. § 13-20-414

Except as otherwise provided in this chapter, all action authorized to be taken under such law by the council or other governing body of any city or of any municipality may be by resolution adopted by a majority of all the members of its council or other governing body, which resolution may be adopted at the meeting of the council or other governing body at which such resolution is introduced and shall take effect immediately upon such adoption, and no such resolution need be published or posted.