What can you say about a line if every point on the line has the same x coordinate?

Oh, dude, if every point on a line has the same x coordinate, that means the line is vertical! It's like the line is standing at attention, with all its points stacked on top of each other in a straight up and down fashion. So yeah, in math lingo, we call that a vertical line with an equation like x = a, where 'a' is the x coordinate all the points share. Cool, right?