Sistem persamaan linier kuadrat dua variabel y-x=5 y=x²+5x-16

jawab

y - x = 5  atau  y = x + 5 (sub ke y = x² + 5x - 16 )
x + 5 = x² + 5x - 16
x² + 4x - 21= 0
(x + 7)(x - 3)= 0
x = - 7  atau x  = 3

y = x + 5
x = -7 → y = -2
x = 3 → y = 8
HP (x,y) = (-7, -2), (3, 8)