Nama : Safitri Npm : 0953010008 Progdi : Teknik Sipil Mata Kuliah : Matematika Rekayasa II Dosen : Ir. Hendrata Wibisana.,MT Tugas X Y X2 XY 1 1.8 1 1.8 2 3.8 4 7.6 3 5.8 9 17.4 4 8.8 16 35.2 5 12.8 25 64 ∑X = 15 ∑Y = 33 ∑X2 =55 ∑XY = 126 Hasil : o                              ∑XY = a∑X2 + b∑X 126 = 55a + 15b ………….(1) o                                  ∑Y = a∑X + nb               33 = 15a + 5b …………..(2) o      Subsitusi pers 1 dan 2 : 126 = 55a + 15b   x 1        55a + 15b = 126   33 = 15a + 5b     x 3        45a + 15 b = 99                                                   10a = 27                                                      a = 2.7 o        Eliminasi pers 1 :       15a + 5b = 33 15 (2.7) + 5b = 33      40.5 + 5b = 33                5b = 33 – 40.5                5b = -7.5                  b = -1.5 Jadi model matematik = Y = ax + b = 2.7 – 1.5