x - 2y = -4

The equation provided is:

$$x - 2y = -4$$

Subtract $x$ from both sides of the equation:

$$-2y = -4 - x$$

Divide both sides by $-2$:

$$y = \frac{-4 - x}{-2}$$ $$y = \frac{-4}{-2} - \frac{x}{-2}$$ $$y = 2 + \frac{1}{2}x$$

This can also be written as:

$$y = \frac{x}{2} + 2$$

Since there is only one equation with two variables, $x$ and $y$, we cannot find unique numerical values for $x$ and $y$. The solution expresses $y$ in terms of $x$.

The solution for $y$ in terms of $x$ is: