Jika x = 1 dan 9x - 3y = 12 maka nilai y adalah

9x - 3y = 12
9.1 - 3y = 12
9 - 3y = 12
-3y = 12 - 9
-3y = 3
y = 3/-3
y = -1

x = 1
9x - 3y = 12
9(1) - 3y = 12
-3y = 12 - 9
y = 3 / -3 = -1
maaf klo salah, smoga bermanfaat