2x-y+z=11 y+z=-1 2x-y=3 Kaya mana kak caranya tolongin ya kak hari ini dikumpulkan???

2x-y+z=11
y+z=-1
z=-1-y
2x-y=3

2x-y-y-1=11
2x-2y=12
2x-y=3
dikurangi
-y=9
y=-9
2x-(-9)=3
2x= -6
x= -3
z=-1-y
z=-1-(-9)
z=8

SPLTV

y + z = -1
z = -1 - y

2x - y + z = 11
2x - y + (-1 - y) = 11
2x - 2y = 12
x - y = 6

2x - y = 3
x - y = 6
Kurangkan
x = 3 - 6
x = -3 ✔

x - y = 6
y = x - 6
y = -3 - 6
y = -9 ✔

y + z = -1
z = -1 - y
z = -1 - (-9)
z = -1 + 9
z = 8 ✔