-4x - 5y - z = 18 -2x - 5y - 2z = 12 -2x + 5y + 2z =4

-4x - 5y - z = 18
-2x - 5y - 2z = 12
------------------------------------------------------ -
2x +3z = -6
-2x + 5y + 2z = 4
5y +3z = -6
-------------------------- -
-2x-z=10

2x+3z = -6
-2x-z =10
------------------+
2z = 4 =>• z = 2

2x+3z = -6 2x + 3(2) = -6 (×5) 10x+30=-30
-2x-z = 10. -2x - (2). = 10( ×4) -8x-8. = 40
-------------------------------------------------------------- +
2x+22= 10
2x =10-22
2x =-12
• x= -6

-2x -5y -2z = 12 (×2) 24-10y-4 = 24
-4x - 5y - z = 18 (×1) 24-5y-2 =18
-------------------------------------------- -
5y +2 =6
5y = 4
• y =4/5
maaf kalo salah