Jika x = 2 dan 9x – 3y =12 maka nilai y adalah?

9x – 3y = 12
9(2) – 3y = 12
18 – 3y = 12
-3y = 12 – 18
-3y = -6
y = -6/-3
y = 2

9x-3y=12
9(2)-3y=12
18-3y=12
-3y=12-18
-3y=-6
y=-6:-2
y=3