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1.)
x + y = 3 | ×2 => 2x + 2y = 6
2x + y = 4 | × 1 => 2x + y = 4
Di atas kita perkurangkan yah, 2x atas dan bawah di coret,sehingga dapat nilai y = 2
utk nilai x
x + y = 3
x + 2 = 3
x = 1
jadi, nilai x = 1 dan y = 2 ...(1,2)
Utk nomor 2 ,3 dan 4 caranya sama sperti di atas.. Semoga membantu ^_^