X+y=8 X²+5x+y=4 Jawabannya apa yaa?

x + y = 8 ↝ y = 8 - x ... (1)

substitusi pers (1)
x² + 5x + y = 4
x² + 5x + (8 - x) - 4 = 0
x² + 4x + 4 = 0
(x + 2)(x + 2) = 0
x = -2

substitusi x = -2 ke (1)
y = 8 - x
y = 8 - (-2)
y = 10

jadi HP = {-2,10}

semoga membantu ^^