soal sistem persamaan linear tiga variabel

Contoh:
4x + 3y - z = 24
2x + y - 2z = 30
X + 4y + z = 16

4x + 3y - z = 24 (x1)
2x + y - 2z = 30 (x2)
Jadi,
4x + 3y - z = 24
4x + 2y - 4z = 60
______________-
y + 3z = -36

4x + 3y - z = 24 (x1)
X + 4y + z = 16 (x4)

Jadi,
4x + 3y - z = 24
4x + 16y - 4z = 64
_______________-
-13y + 3z = -40

y + 3z = -36
-13y + 3z = -40
____________-
14y = 4
y = 0,28

y + 3z = -36
0,28 + 3z = -36
3z = -36,28
z = -12

4x + 3y - z = 24
4x + 3(0,28) - (-12) = 24
4x + 0.84 + 12 = 24
4x + 12,84 = 24
4x = 11,16
x = 2,79

SPLTV { 2,79 ; 0,28 ; -12 }

Semoga membantu :-)