Pengaruh Model Pembelajaran Discovery Learning Dengan Bantuan Aplikasi Geogebra Terhadap Hasil Belajar Siswa Pada Materi Persamaan Garis Lurus Kelas Viii SMP Negeri 7 Pematangsiantar

Low student achievement in mathematics, particularly in understanding abstract concepts and graphical representations of straight-line equations, remains a major challenge at the junior high school level. This study aimed to examine the effect of the Discovery Learning model assisted by the GeoGebra application on eighth-grade students' mathematics learning outcomes in linear equations at UPTD SMP Negeri 7 Pematangsiantar. Methods: A quantitative approach with a pre-experimental One-Shot Case Study design was conducted involving 30 students of class VIII-4 selected through cluster random sampling from a population of 288 students. Data were collected using a 20-item multiple-choice achievement test and a 20-item Likert-scale student perception questionnaire. Both instruments were validated by experts and empirically tested, confirming high reliability with Cronbach’s alpha values of 0.907 for the test and 0.862 for the questionnaire. Prerequisite normality and linearity tests were performed prior to simple linear regression, partial t-test, and coefficient of determination analyses. Results: Descriptive analysis showed an average perception score of 59.20 (74.0%) and an average learning outcome of 15.23 (76.2%). Hypothesis testing confirmed a positive and significant effect (t-count = 7.588 > t-table = 2.048; Sig. < 0.05) with the regression equation Y = 2.272 + 0.219X and R² = 0.673, indicating a 67.3% contribution. Novelty: This study empirically integrates students' perception of GeoGebra-assisted Discovery Learning with cognitive achievement in linear equations.