di berikan SPLTV 3a-b+2c=16 2a+b+c=1 4a-2b+c=18 nilai a-b+c=

substitusikan pers 1 dan 2
3a - b + 2c = 16
2a + b + c = 1 
______________+
51 + 3c = 17 ...(4)

substitusikan pers 2 dan 3
2a + b + c = 1 (dikali 2)
4a - 2b + c = 18 (dikali 1)

| x2 | 4a + 2b + 2c = 2
| x1 | 4a - 2b + c = 18
__________________+
8a + 3c = 20 ...(5) 

substitusikan pers 4 dan 5
5a + 3c = 17
8a + 3c = 20
__________-
-3a = -3
a = 1

eliminasikan pers 4 untuk mendapatkan nilai C
5a + 3c = 17
5(1) + 3c = 17
5 + 3c = 17
3c = 12
c = 4

elimanasikan a = 1 dan c = 4 ke pers 1
3a - b + 2c = 16
3(1) - b + 2(4) = 16
3 - b + 8 = 16
-b = 16 - 3 - 8
-b = 5
b = -5

jadi nilai a - b + c = 1 - (-5) + 4 = 10