Question

Xkuadrat-y=5
2x+y=3
Tolong bantu ya

Answer 1

Verified answer

2x + y = 3
y = -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)}