Final answer:
The equation of a line with an undefined slope passing through the point (-2, 18) is x = -2.
Step-by-step explanation:
The question asks to find the equation of a line with an undefined slope that passes through the point (-2, 18). A line with an undefined slope is a vertical line. Vertical lines have an equation of the form x = a, where a is the x-coordinate of any point the line goes through. Since the given point is (-2, 18), the equation of the line that passes through this point is x = -2.