The equation $x = -4$ represents a vertical line in the rectangular coordinate system. Since the equation gives a constant value for $x$, the line is vertical and passes through $x = -4$ for all values of $y$.

I can describe or graph it for you:

• The line is parallel to the $y$-axis.
• The line crosses the $x$-axis at $(-4, 0)$, but continues infinitely both upwards and downwards, for all $y$-values.

Would you like me to create a visual representation of this graph?

Here are 5 related questions:

1. What does a horizontal line equation look like?
2. How do you determine the slope of a vertical line?
3. How does the graph of $y = -4$ differ from $x = -4$?
4. What happens when you graph a line parallel to the $x$-axis?
5. How do you write the equation of a line parallel to $x = -4$ but shifted 3 units to the right?

Tip: A vertical line has an undefined slope, as there is no change in $y$ for any change in $x$.