Siahaan, M. M. L., Fitriani, F., & Manek, P. (2021). Hypothetical Learning Trajectory: To Determine The Solution of Linear Equation System in Elementary Row Operation. Mathline : Jurnal Matematika Dan Pendidikan Matematika, 8(1), 246–255. https://doi.org/10.31943/mathline.v8i1.379