Simplify. \[ -3(y+3)+4 y \]

Step 1 ：Distribute -3 to both y and 3 inside the parentheses: -3*y - 3*3 = -3y - 9

Step 2 ：Combine like terms: -3y - 9 + 4y = y - 9

Step 3 ：\(\boxed{y - 9}\) is the simplified form of the expression.