kalo ini gimana? bantu saya. trmksh

x - 2y + z = 6 ....(1)
3x + y - 2z = 4 ....(2)
7x - 6y - z = 10 ....(3)

eliminasi (1) dan (3)
x - 2y + z = 6
7x - 6y - z = 10
............................. +
8x - 8y = 16
x - y = 2 .....(4)

eliminasi (2) dan (3)
3x + y - 2z = 4 .....(x1)
7x - 6y - z = 10 ......(x2)
sehingga
3x + y - 2z = 4
14x - 12y - 2z = 20
...................................... –
-11x + 13y = -16 ..... (5)

eliminasi (4) dan (5)
x - y = 2 ........(x11)
-11x + 13y = -16 (x1)
sehingga
11x - 11y = 22
-11x + 13y = -16
.............................. +
2y = 8
y = 8/2
y = 4

substitusi y = 4 ke (4)
x - y = 2
x - (4) = 2
x = 2 + 4
x = 6

substitusi x = 6 dan y = 4 ke (1)
x - 2y + z = 6
6 - 2(4) + z = 6
6 - 8 + z = 6
-2 + z = 6
z = 6 + 2
z = 8

jadi x = 6, y = 4, dan z = 8