Adi Suarman Situmorang and Enjelika Pandiangan 2022. Analysis Of Mathematical Communication Skills On The Material Of Two-Variable Linear Equation System In Smp Negeri 7 Medan. International Journal Of Humanities Education and Social Sciences (IJHESS) . 2, 1 (Aug. 2022). DOI:https://doi.org/10.55227/ijhess.v2i1.243.