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(II) 6y - 2z = 10
(III) x + 2z = 1
------------------------ (+)
(IV) 6y + x = 11
Eliminasi persamaan (I) & (IV)
(IV) 2x + 12y = 22
(I) 2x + y = 11
--------------------------- (-)
11y = 11
(●) y = 1
Substitusi persamaan (I)
2x + y = 11
2x = 11 - 1
(●) x = 5
Substitusi persamaan (III)
x + 2z = 1
2z = 1 - 5
(●) z = (-2)
HP = {(5,1,-2)}
Maka nilai x - y + z
= 5 - 1 - 2
= 2 (■)