(a)
A majority of the members of the governing body shall constitute a quorum for the transaction of business, and all official acts of the governing body shall require the affirmative vote of a majority of the members present and voting.(b)
No official act shall be approved with less than the affirmative vote of four members of the governing body, unless the number of members prohibited from voting because of conflicts of interest precludes adequate participation in the vote.
Source:
Section 14087.9635, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=WIC§ionNum=14087.9635..