<![CDATA[This study is an experimental study that aims to determine the effectiveness of the Problem Based Learning (PBL) and Project Based Learning (PJBL) models assisted by GeoGebra on students' problem-solving abilities in the Two-Variable Linear Inequality System material at SMA Negeri 1 Jepara. The population in this study were all grade X students in the 2024/2025 academic year. The research sample consisted of three classes, namely class X-1 as experimental group 2 (PJBL), X-2 as experimental group 1 (PBL), and X-3 as the control group (conventional learning). Data collection techniques used problem-solving ability tests, student activity observation sheets, and documentation. The results of the study showed that: (1) there was a significant difference in problem-solving abilities between the three learning models used; (2) the problem-solving abilities of students using the PBL model were higher than conventional learning; (3) the problem-solving abilities of students with the PJBL model were also higher than conventional learning; (4) there was no significant difference between the problem-solving abilities of students using the PBL and PJBL models; (5) Student activity contributes to problem solving ability by 21.2% in the PBL model and 56.3% in the PJBL model. This finding shows that both the PBL model and the GeoGebra-assisted PJBL are effective in improving students' mathematical problem solving abilities, with a greater influence of activity in the PJBL model.]]>
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