4x + 3y + z = 4 2x - 6y + z = 0 6x + 9y + 2z = 8

x=1-3/4y-2/4,yER,zER
x=3y-2/2,yER,zER
x=4/3-3/2y-1/3z,yER,zER

4x + 3y + z = 4
2x - 6y + z = 0
---------------------- -
2x + 9y = 4 => pers.1

4x + 3y + z = 4 (× 2)
6x + 9y + 2z = 8 (× 1)

8x + 6y + 2z = 8
6x + 9y + 2z = 8
------------------------ -
2x - 3y = 0 => pers.2

pers.1 => 2x + 9y = 4
pers.2 => 2x - 3y = 0
.................------------------ -
.......................12y = 4
.........................y = 4/12
.........................y = 1/3

2x + 9y = 4
2x + 9(1/3) = 4
2x + 3 = 4
2x = 4 - 3
2x = 1
x = 1/2

4x + 3y + z = 4
4(1/2) + 3(1/3) + z = 4
2 + 1 + z = 4
3 + z = 4
z = 4 - 3
z = 1

Jadi nilai x , y , z adalah 1/2 , 1/3 , 1