Konstruksi Konsep Sistem Persamaan Linier Tiga Variabel Bagi Siswa SMA Berdasarkan Teori APOS

The main purpose of this study is to describe the construction of the concept of a three-variable system of linear equations for high school students based on APOS Theory. The approach used in this research is the APOS Research Cycle. The subject of this research is a class XI student who has received material on a three-variable system of linear equations. The instruments used in this study were written test questions and semi-structured interviews. The data analysis technique was carried out qualitatively with 3 stages, namely data reduction, data presentation, and verification or conclusion drawing. The results showed that Subject S experienced a mental interiorization mechanism, namely the action stage to the process stage was not perfect, the encapsulation mechanism, namely the process stage to the object stage was perfect, the mental de-encapsulation mechanism, namely the object stage to the process stage, was not perfect, the mental assimilation mechanism, namely the object stage. with the new schema, namely the schema of algebraic operations is not perfect, and the mental coordination mechanism, namely the object stage to the object stage is perfect.