Dr. Sri Hariyani, M.Pd.1"Ancient sites as ethnomathematics for strengthening Profil Pelajar Pancasila in Malang "2ANALISIS PEMECAHAN MASALAH MATEMATIKA MENURUT POLYA MATERI SISTEM PERSAMAAN LINIER DUA VARIABEL3DEVELOPMENT OF STRUCTURED STUDENT WORKSHEETS ON PROBLEM-BASED LEARNING MATERIAL LINEAR EQUATIONS WITH ONE VARIABLE