So then the answer would be 6x + 4 + y

Or 6xy + 4

I have no idea what your problem is.

Y=x-3

In order to determine the correct answer, we would need more context or information. It seems like you are referring to an equation or expression involving the variables x and y.

If you are given an equation or expression and asked to simplify or combine like terms, then you would need to follow certain rules. Let's break down the possibilities you provided:

1. 6x + 4 + y: This expression simply involves adding the terms together. If there are no like terms to combine, you can consider it to be simplified.

2. 6xy + 4: Here, we have a multiplication between the terms 6x and y. If there are no other like terms to combine, this would be considered simplified. It is important to note that if there are any other terms involving x and/or y, we would need to check if they can be combined in any way.

To provide a more accurate answer, could you please provide the full context or equation related to your question?

Remember, it is always helpful to carefully read and consider the given problem or equation in order to determine the correct approach for solving or simplifying it.