x-y-z==2 x+y-z=6 2x+3y+2z=10 brpa x,y,z brp nilai dr 3x+2y-4z=...

x - y - z = 2
x+y - z = 6
___________-
-2y = -4
y = 2

x -

2x + 3y + 2z = 10
2x + 3(2) + 2z = 10

2x + 2z = 4

......
2x - 2(2) - 2z = 2

2x - 2z = 2
2x + 2z =4
_________-
- 4 z = -2
z = 1/2

x -2 - 1/2 = 2
x = 9/2


3x + 2y - 4z = 3(9/2) + 2(2) - 4(1/2)
= 27/2 + 4 - 2
= 27/2 + 2
= 31/2