Find the equation of a vertical line that passes through the point .

You seem to have missed providing the specific point through which the vertical line passes. However, I can tell you the general form of the equation for a vertical line.

A vertical line's equation is always in the form of x = k, where k is the x-coordinate of any point the line passes through. So if your point was (a, b), the equation of the vertical line passing through this point would be x = a.