x+y+z=7 x-y+z=5 4x-2+z=10 HP dari persamaan tersebut yaitu

x+y+z =7
x-y+z = 5
_________-
2y = 2
y = 1




x-y+z =5
4x-2+ z = 10

x-1+z =5
4x-2+z = 10
_________-
-3x + 1 = - 5
-3x = - 5-1
-3x = - 6
x = 2


x+y+z = 7
1 + 2 + z = 7
3 +z = 7
z = 7-3
z = 4


(x, y, z = 1,2 dan 4)