The equation x=4 is a very special case in mathematics. It's not a complex equation involving multiple unknowns or mathematical operations, it's just one very simple and direct statement: x equals 4.
Let's now think of this relation in a visual or geometric way, which is often more intuitive and helps to understand the concept better.
In the coordinate system, we usually represent the values of x and y on two axis, with x being the horizontal axis and y being the vertical axis. Each point in this plane is determined by a pair of coordinates (x, y).
Now, in our case, the relation we have is x=4. What this essentially means is that no matter what the value of y is, the value of x is always 4.
Visualize this on a graph. Start at the origin (0,0), move right along the x-axis and stop at the point (4,0). From this point, if we move vertically upward or downward, we are still at x=4, regardless of our position on the y-axis.
Resulting from this, we can conclude that the graph of the equation x=4 is a straight, vertical line that crosses the x-axis at the point x=4.
So, in conclusion, the relation x = 4 is better understood as a vertical line at x = 4 on a graph.