Any municipality located in two adjacent counties which forms a part of a municipal separate school district the territory of which is located in two adjacent counties which desires to enter into the establishment of an enterprise under the provisions of Sections 57-1-1 through 57-1-51, jointly with the territory forming a part of such municipal separate school district shall, by and through its governing authority, declare its intention of entering into such plan by resolution spread upon its minutes and shall jointly with the boards of supervisors of the counties affected file with the Mississippi Agricultural and Industrial Board, a petition for certificate of public convenience and necessity in the manner and for the purpose prescribed by Section 57-1-21, and the governing authority of such municipality is authorized to proceed under Sections 57-1-1 through 57-1-51, for and on behalf of the municipality and the municipal separate school district territory the same as if such territory were a part of said municipality.