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x+2y+z=4
2x+y+z=5
nilai x+y+z=...
x+y+2z=3 x+2y+z=4 |x2| 2x+4y+2z=8
x+2y+z=4 ₋ 2x+y+z=5 |x1| 2x+ y+z =5 ₋
-y+z =-1 3y+z = 3
-y+z =-1
3y+z=3 ₋
-4y =-4
y = 1 ⇒ -y+z =-1
-1+z =-1
z = 0 ⇒ x+y+2z = 3
x+1+2(0) =3
x+1+0 =3
x= 2
Jadi nilai x+y+z = 2+1+0 = 3