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saat (-1,0):
0 = a-b+c..............1
saat (1,4):
4 = a+b+c............2
saat (2,7):
7 = 4a+2b+c.......3
eliminasi b dari pers 1 n 2:
0 = a- b+c
4 = a+b+c (+)
4 = 2a+2c
2 = a+c.............4
eliminasi b dari pers 1 n 3:
0 = 2a-2b+2c
7 = 4a+2b+c (+)
7 = 6a+3c..........5
eliminasi c dari pers 4 dan 5:
6 = 3a+3c
7 = 6a+3c (-)
-1 = -3a
a = 1/3..............maka c = 5/3
subtitusi a= 1/3 dan c= 5/3 ke pers 1:
0 = a-b+c
0 = (1/3)-b+(5/3)
b = 6/3
b = 2
maka a= 1/3, b= 2, dan c= 5/3