Per Section 62 of R.A. 7926 Muntinlupa and Las Piñas were to constitute separate congressional districts, with each district electing its separate representative in the 1998 elections.
This passage refers to a specific law (R.A. 7926) that divided Muntinlupa and Las Piñas into separate congressional districts for the 1998 elections, ensuring each district elects its own representative.