Final answer:
To simplify the expression x-negative 3y minus 9 hays, combine the like terms and write the simplified expression as x - 3y - 9. The answer is True.
Step-by-step explanation:
The expression is x-negative 3y minus 9 hays. To simplify this expression, we need to combine like terms. The like terms in this expression are the x term, the negative 3y term, and the constant term -9.
The expression can be simplified as: x - 3y - 9
So, the answer is (a) True.