Question

x - y + z = 0
2y - 2z = 2
-x + 2 y + 2z = 29

Answer 1

X-y-z = 0
2x - 2z = 2
-x + 2y + 2z = 29

Maka,
-x + 2y + 2z = 29
x-y-z = 0
_____________ +
y + 3z = 29 .......(×2)
2y - 2z = 2 ........(×1)
_______________
2y + 6z = 58
2y - 2z = 2
___________ +
8z = 56
z = 7

Masukkan,
2y - 2z = 2
2y - 2(7) = 2
2y - 14 = 2
2y = 2 + 14
2y = 16
y = 8

x - y - z = 0
x - (8) - (7) = 0
x - 15 = 0
x = 15

Jadi, x = 15, y = 8, z = 8