NURUL IZATUL AZIZAH, NIM. 2110246783, Development of Approach-Based Electronic Teaching Materials Contextual Teaching and Learning (CTL) on Systems of Linear Equations and Inequalities Phase E to Improve Mathematical Problem Solving Skills, supervised by Dra Yenita Roza, Ph.D and Dr Kartini, M.Si. This research was motivated by the low level of students' mathematical problem solving skills and…