This research aims to analyze students' misconceptions about straight line equations, using the Three Tier-Test instrument and interviews. This research has subjects, namely class VIII B students at SMPN 15 Serang City with a total of 19 students. This research resulted in: (1) Misconceptions experienced in each category of students' initial abilities. (2) The cause of a misconception faced by students. (3) How to overcome misconceptions faced by students.
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