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3a + b - 3c = 17 ... (2)
5a - c = 0
c = 5a
nilai c dimasukkan ke persamaan (3), yakni persamaan: 2a - 2b + c = -21
2a - 2b + 5a = -21
7a - 2b = -21 ... (4)
nilai c dimasukkan ke persamaan (1) sehingga menjadi:
2a - b + 2(5a) = -17
2a - b + 10a = -17
12a - b = -17 ... (5)
persamaan diatas dikali 2, sehingga menjadi:
24a - 2b = -34
7a - 2b = -21 ... (4)
17a = -13
a = -
nilai a dimasukkan ke c = 5a = 5 x - = -
nilai a dan c dimasukkan ke persamaan (3) :
2(- ) - 2b - = -21
- - - 2b = -21
- - 2b = -21
2b = 21 - = - =
b =
jadi :
a = -
b = = 7
c = - = -3