Hasil dari X Y memenuhi sistem X + Y + Z =2 X -Y+Z= -2 X-Y-Z = 2 adalah?

(I) x + y + z = 2
(II) x – y + z = -2
———————- –
2y = 4
y = 2

(I) x + 2 + z = 2
x + z = 0
(III) x – 2 – z = 2
x – z = 4

x + z = 0
x – z = 4
————- –
2z = -4
z = -2

x + y + z = 2
x + 2 – 2 = 2
x = 2