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Verified answer
2x + y = 3y = -2x + 3
x^2 - y = 5
x^2 - (-2x + 3) = 5
x^2 + 2x - 3 = 5
x^2 + 2x - 3 - 5 = 0
x^2 + 2x - 8 = 0
(x + 4)(x - 2) = 0
x + 4 = 0 atau x - 2 = 0
x = -4 atau x = 2
x = -4 => 2x + y = 3
...........=> 2(-4) + y = 3
...........=> -8 + y = 3
...........=> y = 3 + 8
...........=> y = 11
(-4 , 11)
x = 2 => 2x + y = 3
..........=> 2(2) + y = 3
..........=> 4 + y = 3
..........=> y = 3 - 4
..........=> y = -1
(2 , -1)
Jadi HP nya adalah {(-4 , 11) dan (2 , -1)}