Tambunan, Yusniar Nova. 2020. “Analysis of Students’ Ability in Solving Two-Variable Linear Equation System (SPLDV) Questions in Class XI SMA Negeri 1 Siborongborong Academic Year 2019/2020”. Jurnal Mantik 4 (2):1465-68. https://doi.org/10.35335/mantik.Vol5.2021.1296.pp184-187.