ABBAS, Nurhayati; KATILI, Nancy; DJOYOSUROTO, Dwi Hardianty. Teaching Materials of Problem-Based Linear Equation System with Two-Variables for Eighth-Grade Students in Junior High School. Journal of Learning and Development Studies, [S. l.], v. 1, n. 1, p. 119–123, 2021. DOI: 10.32996/jlds.2021.1.1.12. Disponível em: https://al-kindipublishers.org/index.php/jlds/article/view/2522. Acesso em: 3 oct. 2025.