Final answer:
The equation of the vertical line passing through the point (1, -1) is x = 1.
Step-by-step explanation:
The equation of the vertical line passing through the point (1, -1) is x = 1.
A vertical line is a line that is parallel to the y-axis and does not have a slope. Since all the points on a vertical line have the same x-coordinate, the equation of a vertical line can be written as x = a, where a is the x-coordinate of any point on the line.
In this case, the x-coordinate of the given point is 1, so the equation of the vertical line passing through the point (1, -1) is x = 1.