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4a-2b+c = 18
-------------------- -
-2a+b = -8
2a-b = 8 (pers. 1)
2a-b+c = 10
8+c = 10
c = 2
2a-b+c = 10 .........(2)
4a-2b+c = 18 .........(3)
(1) dan (2)
3a-b+2c = 16
2a-b+c = 10
------------------------- (kurangkan)
a-0+c = 6
a+c = 6 ...(4)
(2) dan (3)
2a-b+c = 10 | kali dua
--------------------------
4a-2b+c = 18 |kali satu
didapat
4a-2b+2c = 20
4a-2b+c = 18
---------------------- (kurangkan)
0-0+c = 2
c = 2
substitusi ke (4) didapat
a+c = 6
a+2 = 6
a = 4
2a-b+c = 10
2(4)-b+2 = 10
8-b+2 = 10
-b+10 = 10
b = 0
HP :={(a,b,c)|a=4,b=0,c=2}