Jika x-y+2z=-5 2x+y+z=-1 X+y-z=3 MAKA BERAPA X,Y,DAN Z?

SPLTV

x - y + 2z = -5 ... (1)
2x + y + z = -1 ... (2)
x + y - z = 3 ... (3)

Jumlahkan (1) dan (2)
3x + 3z = -6
x + z = -2 ... (4)

Kurangkan (2) dan (3)
x + 2z = -4 ... (5)

Kurangkan (4) dan (5)
-z = -2 - (-4)
z = -2 ✔

x + 2z = -4
x - 4 = -4
x = 0 ✔

x + y - z = 3
0 + y + 2 = 3
y = 1 ✔