x+2y=0 dan 2x+y=9 Pakek substitusinya ya

Materi : SPLDV

x + 2y = 0
2x + y = 9

x + 2y = 0
x = 0 - 2y
x = -2y

2x + y = 9
2(-2y) + y = 9
-4y + y = 9
-3y = 9
y = -3

x + 2y = 0
x + 2(-3) = 0
x = 6

Hp = {6 , -3 }