Persamaan linear tiga variabel Tentukan x+y+z =... 2x+y = 11 3y-z = 5 x+2z = 1

2x + y = 11
2x + 4z = 2
____-
y + 4z = 8

3y-z = 5
3y+12z = 24
____-
-13z = - 21
z= 21/13

x + 2 ( 21/13 ) = 1
x + 42/13 = 1
x = 1 - 42 /13
x = 1 - 3 . 3/13
x = -2 3/13


3y - 21/3 = 5
3y = 15/3 - 21/3
3y = - 6/3
y= -6/9