Tarigan, L. R. B., & Mangaratua Marianus Simanjorang. (2023). Improving Student Mathematics Learning Outcomes Through the Problem Based Learning (PBL) Learning Model on Linear Program Material in Class XI SMA Negeri 1 Tigabinanga. Formosa Journal of Multidisciplinary Research, 2(1), 163–176. https://doi.org/10.55927/fjmr.v2i1.2694