The equation provided is:

$x - 2y = 4$

To determine the values of $x$ and $y$, we need more information, such as another equation to solve a system of linear equations, or one of the variables must be given. If you have another equation or value for $x$ or $y$, please provide it.

Would you like to share additional details or clarify the missing information? If this is part of a larger system, I can help solve it once I have the complete problem.

Here are 5 related questions to expand on this:

1. Do you have another equation to form a system of equations with this one?
2. Are you solving for $x$ in terms of $y$ or for $y$ in terms of $x$?
3. Are there any specific constraints or conditions provided for this equation?
4. Would you like to see a graphical representation of the equation?
5. Are you looking for integer or real number solutions for $x$ and $y$?

Tip: When solving for two variables, it's often necessary to have two independent equations (a system) in order to find unique values for both variables.