No ordinance or resolution shall contain more than one subject which shall be clearly expressed in its title, and no ordinance or resolution shall be revised or amended unless the new ordinance or resolution contains the entire ordinance or resolution revised, or the section or sections as so amended, and the section or sections so amended shall be considered to be repealed. This requirement shall not prevent the amendment of an ordinance or resolution by the addition of new sections and in such case the full text of the ordinance or resolution need not be set forth.
An affirmative vote of four or more members of Council shall be required for the enactment of every resolution or ordinance, unless a larger number be required by the provisions of this Charter.