Fransiskus X E Lie / 0953210064 tugas mathrek

X1	X2	X3	Y	X12	X22	X32	X1 . X2	X1 . X3	X1 . Y	X2 . X3	X2 . Y	X3 . Y
1	40	1	664	1	1600	1	40	1	664	40	26560	664
2	20	2	454	4	400	4	40	4	908	40	9080	908
3	40	1	514	9	1600	1	120	3	1542	40	20560	514
				0	0	0	0	0	0	0	0	0
1	20	2	564	1	400	4	20	2	564	40	11280	1128
2	40	1	574	4	1600	1	80	2	1148	40	22960	574
3	20	2	314	9	400	4	60	6	942	40	6280	628
			∑	28	6000	15	360	18	5768	240	96720	4416

∑X1 Y = a∑X1² + b∑X1 X2 + c∑X1 X3 ……..(1)

∑X2 Y = a∑X2² + b∑X2 X1 + c∑X2 X3 ……..(2)

∑X3 Y = a∑X3² + b∑X3 X1 + c∑X3 X2 ……..(3)

5768 = 28a +­­­­ 360b + 18c ………(1)          

96720 = 360a + 6000b + 240c ……….(2)

4416 = 18a + 240b + 15c …………(3)

A = -100

B = 15.4

C = 168

28a +­­­­ 360b + 18c = 5768              x 6000    168.000a + 2.160.000b + 108.000c = 34.608.000

6000a + 360b + 240c = 96720     x 28        168.000a + 10.080b + 6.720c           = 2.708.160       -

                                                                                             2.149.920b + 101.280c  = 31.899.840 ………..(4)