<![CDATA[This study aims to analyze the effectiveness of the Problem Based Learning (PBL) model in improving students’ mathematics learning outcomes on the topic of Systems of Two-Variable Linear Equations (SPLDV). The research subjects were 20 twelfth-grade students of SMA Negeri 1 Percut Sei Tuan, using a quantitative descriptive approach and a one-group pretest–posttest design. The research instrument consisted of an achievement test based on cognitive indicators C4 (analysis), C5 (synthesis), and C6 (evaluation). The results show a clear improvement in students’ learning outcomes after the implementation of PBL. The average pretest score of 16.55 increased to 25.1 on the posttest, while the N-Gain score of 0.63 falls into the medium category. The distribution of learning outcome categories also shifted positively: in the pretest, 7 students were in the low category, 10 in the medium category, and 3 in the high category; whereas in the posttest, no students remained in the low category, 5 were in the medium category, and 15 were in the high category. These findings indicate that the implementation of PBL can enhance students’ analytical skills, problem-solving abilities, and conceptual understanding of SPLDV more deeply, making it an effective instructional model for improving the quality of mathematics learning processes and outcomes.]]>
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