Alfiyah, Khomsyatun, and Nadia Arisa. “STUDENTS’ CONCEPTUAL UNDERSTANDING OF SYSTEMS OF LINEAR EQUATIONS IN TWO VARIABLES: A DESCRIPTIVE QUANTITATIVE STUDY AT THE JUNIOR HIGH SCHOOL LEVEL”. Perpendicular : Journal of Mathematics Education and Learning, vol. 1, no. 2, Dec. 2025, pp. 80-89, https://doi.org/10.61994/perpendicular.v1i2.1532.