Tarigan, Lola Ressa Br, and 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):163-76. https://doi.org/10.55927/fjmr.v2i1.2694.