The y intercept
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Any line that goes straight up and down and doesn't lean either way is a vertical line.
If x equals a constant number, the graph will be a vertical line. For example, the graph of x = 5 would be a vertical line that goes through the point (5,0). x equals 5 on every point along this lines.
Yes
any points along the line described by the equation x=anything will give you a vertical line on a graph
Yes the graph of a function can be a vertical or a horizontal line