Answer:
Explanation:
We know that:
If the line is a vertical line on a graph, then this means that the x coordinate is 0 while the y-intercept is un-identified. Looking at the options and the formula, x = 0 is the most reasonable option because a vertical line on a coordinate plane basically defines that the x coordinate is 0.
Hence, x = 0 must be correct.
Hoped this helped.