It is: x = k whereas k is a numerical value on the x axis and is a line parallel to the y axis through (k, 0)
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In a vertical line, all the x values will be the same. This means that all vertical lines will have the equation X=?
No. Vertical lines are not.
The slope of a vertical line is not defined.
No because a line can be a vertical line so say you have the equation x=5. Then a vertical line would pass through the x intercept 5 and be vertical thus not having a y intercept. All horizontal lines have a y intercept
Yes.