Sec. 9. (a) A majority of the members appointed to the board constitutes a quorum for a meeting.
(b) Except as provided in subsection (c), the board may act officially by an affirmative vote of a majority of those present at the meeting at which the action is taken.
(c) If the authority includes Lake County, then:
(1) an affirmative vote of a majority of the board is necessary for an action to be taken; and
(2) a vacancy in membership does not impair the right of a quorum to exercise all rights and perform all duties of the board.