x+y-z=0,x-y-z=4,x+2y+z=-4 bantu saya kakak tolong jawab sekarang . terimakasih

Materi : SLPTV
Kelas : X SMA

x + y - z = 0 ........... 1)
x - y - z = 4............. 2)
x + 2y + z = -4 ....... 3)

x + y - z = 0
x - y - z = 4
◆◆◆◆◆◆◆◆◆ [-]
2y = -4
y = -2

x + y - z = 0
x + 2y + z = -4
◆◆◆◆◆◆◆◆◆◆◆ [-]
-y - 2z = 4

-y - 2z = 4
-(-2) - 2z = 4
2 - 2z = 4
-2z = 4 - 2
-2z = 2
z = -1

x + y - z = 0
x + (-2) - (-1) = 0
x - 2 + 1 = 0
x - 1 = 0
x = 1

Hp = { 1 , -2 , -1 }