The purpose of this study was to identify the mistakes students made when solving questions on straight line equations material and to find out what are the causative factors of the difficulties students experience when working on solving straight line equations material answers. The subjects of this study were eighth grade students of SMPN 3 Ngamprah and the sample was 25 students. Qualitative descriptive method is the method used in this study. Data obtained from the tests result that have been carried out. The questions given with the level of difficulty are easy, difficult, and very difficult. The results of this study indicate that when students complete the answers to questions, students are not careful in understanding straight-line equations, students are wrong in transforming questions, students make mistakes when carrying out arithmetic operations, students do not master the concept of material in a comprehensive way. broad, the inaccuracy of students when determining the final answer to the question. The low interest of students in learning mathematics and the lack of motivation in learning students are the main factors for mistakes made by students in solving the answers to questions.mathematics so they make many mistakes in answering questions. straight line equation material
