The purpose of this study is to find out the difficulties experienced by students in solving mathematical problems, especially in working on or solving problems in the two-variable linear equation system material and to find out the causes of difficulties in the two-variable linear equation system material that has been carried out by grade VIII students. This type of research is qualitative research, namely by making observations, then the researcher gives several questions given to the research subject to work on. The test instrument used in this study is in the form of 2 questions, namely about the material of the two-variable linear equation system that has been validated. The subjects in this study were 19 students in class VIII A who participated in the research process, then the researcher selected 6 students as representatives of the research subjects. The instrument of this study is a written test by giving questions, then interviews. In the results of the research that have been observed along with the results of interviews used to determine the type of difficulty students in solving problems of the two-variable linear equation system, the test results show that students experience difficulties shown by making mistakes in working on the problem. The causes of students' difficulties that often occur are usually lack of concentration when working, difficulties when faced with different forms of problems, forgetting the material that has been taught.