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x - y = 4 +
2x = 14 ⇒ x = 7
x - y = 4 ⇔ 7 - y = 4 ⇔ y = 7-4 = 3
HP { (7,3) }
2) x + y = 3
x - 3y = -1 -
4y = 4 ⇒ y = 1
x + y = 3 ⇔ x + 1 = 3 ⇔ x = 3-1 = 2
HP { (2,1) }