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3x + 4y = 6 | × 5 | ⇒ 15x + 20y = 30
5x + 6y = 8 | × 3 | ⇒ 15x + 18y = 24 -
⇒ 2y = 6
⇒ y = 3
3x + 4y = 6
3x + 12 = 6
3x = 6 - 12
3x = -6
x = -2
5x + 6y = 8 (Dikali 3)
15x + 20y = 30
15x + 18y = 24
2y = 6
y = 3
3x + 4y = 6
3x + 4(3) = 6
3x = 6-12
3x = -6
x = -2
Jadi, HPnya {(-2, 3)}