y=x is not a vertical line. It is diagonal in between the x and y axis. However, if this question is referring to x=constant, like x=3 or x=5, the corresponding graph will always be a vertical line. This is because the equation only provides restraints regarding x. No matter what y value is plugged into the equation, x will always remain constant.
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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=?
The equation of every vertical line is [ X = the value of 'x' where the line crosses the x-axis ].
a vertical line at x=3
A vertical line in the xy coordinate plane would represent the line of an equation such as x = 1 or x = -4.
Its more like short-hand such as Y=vertical and X=horizontal