a) -8x +4y -3z = -2 b) 2x- 3y + 2z = -10 c) 5x- y = 11

-8x +4y -3z = -2 ..... (1)
2x- 3y + 2z = -10 ......(2)
5x- y = 11 .... (3)

eliminasi (1) dan (2)
-8x +4y -3z = -2 ....(x2)
2x- 3y + 2z = -10 ....(x3)
sehingga
-16x + 8y - 6 z = -4
6x - 9y + 6z = -30
..,.................................. +
-10x - y = -34 ......(4)

elimnasi (3) dan (4)
5x- y = 11
-10x - y = -34
......................... –
15x = 45
x = 45/15
x = 3

substitusi x = 3 ke (3)
5x - y = 11
5(3) - y = 11
15 - y = 11
y = 15 - 11
y = 4

substitusi x = 3 dan y = 4 ke (2)
2x- 3y + 2z = -10
2(3) - 3(4) + 2z = -10
6 - 12 + 2z = -10
-6 + 2z = -10
2z = -10 + 6
2z = -4
z = -4/2
z = -2