So if we're talking about the limit as x approaches one, of one over x minus one. If you just try to evaluate this expression at x equals one, you would get one over one minus one, which is equal to one over zero, which says, okay, I'm falling into this vertical asymptote case. And at that point, if you wanted to just understand what was going on there, or even verify that it's a vertical asymptote, well, then you could try out some numbers, you could try to plot it. You could say, all right, I probably have a vertical asymptote here at x equals one. So that's my vertical asymptote. And you could try out some values. Well, let's see, if x is greater than one, the denominator is going to be positive.