(a) If a municipality has not adopted a manager plan of government, the mayor is the chief administrator and the mayor has the same powers and duties as those of a manager under AS 29.20.500.
(b) The mayor may take part in the discussion of a matter before the governing body. The mayor may not vote, except that the mayor of a first class city or the mayor of a borough with a manager form of government may vote in the case of a tie. The mayor of a second class city, as a council member, may vote on all matters.