Tentukan HP dari SPLTV ?

X-y + 2z = 5 (1)
2x + y -z = 9. (2)
x – 2y + 3z = 4. (3)

=> (1 ) x – y + 2z = 5
(2) 2x + y – z = 9
______________ +
3x + z = 14 (4)

=> (1 ) x – y + 2z = 5 | 2 | 2x – 2y + 4z = 10
(3) x – 2y + 3z = 4 | 1 | x – 2y + 3z = 4
_____________ –
x + z = 6 (5)

=>(4) 3x + z = 14
(5) x + z = 6
__________-
2x = 8
x = 4

=> x + z = 6
4 + z = 6
z = 6 – 4
z = 2

=> x – y + 2z = 5
4 – y + 2(2) = 5
4 – y + 4 = 5
8 – y = 5
-y = 5 – 8
-y = -3
y = 3

HP = { 2, 3, 4}