Mich. Comp. Laws § 331.1259

Sec. 259. A majority of the trustees serving on a board or subsidiary board of a corporation incorporated by a city or village shall constitute a quorum for the transaction of business of the corporation or subsidiary corporation, respectively. Except as otherwise specifically provided in this act, actions taken by a board of trustees or subsidiary board shall be by a vote of a majority of the members serving on the board or subsidiary board.