KEMAMPUAN PENALARAN MATEMATIS SISWA BERDASARKAN SELF CONFIDENCE DAN ETNIK DALAM MENYELESAIKAN SOAL PROGRAM LINEAR

: The study's goal is to describe students' mathematical reasoning abilities in solving linear program problems based on self-confidence and ethnicity. This type of research is qualitative. Students of Class XI in Singkawang high school are ethnic Tionghoa, Malay, and Madura. The instruments used in this study are mathematical reasoning and self-confidence tests and interviews. Based on the results of research and references from previous researchers, it appears that, 1) students with high self-confidence who can make mathematical manipulations, check the validity of arguments, and draw conclusions can mostly reach such indicators of mathematical reasoning ability. Students with moderate self-confidence are only partially able to complete it accurately and completely. Students with low self-confidence, which is a some students, can achieve indicators of mathematical reasoning ability. 2) Chinese ethnic students can partially perform mathematical manipulation and check authenticity. Some ethnic Malay students can do mathematical manipulation. Some Madurese ethnic students can manipulate mathematics, and check the validity of arguments