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2x + z = 7 ..... (1)
y - z = -2 → y = z - 2
x + y = 2 → x + (z-2) = 2 → x + z = 4 ..... (2)
Eliminasi (1) dan (2), maka
⇨ 2x + z = 7
⇨ x + z = 4
----------------- --
⇨ x = 3
Masukkan nilai x ke (2) didapat
⇨ x + z = 4
⇨ 3 + z = 4
⇨ z = 1
Masukkan nilai z ke y = z - 2, maka
⇨ y = z - 2 = 1 - 2 = -1
Jadi x = 3, y = -1 dan z = 1