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x = 4 - y
subsiitusikan x = 4 - y ke persamaan (2)
4x + 3y = 13
⇔ 4(4 - y) + 3y = 13
⇔ 16 - 4y + 3y = 13
⇔ 16 - y = 13
⇒ y = 16 - 13
⇒ y = 3
Kemudian subsitusikan y = 3 ke persamaan (1)
⇔ x + y = 4
⇔ x + 3 = 4
⇔ x = 4 - 3
⇒ x = 1
Maka HP = {(1,3)}