SOLUTION: Can you tell me why line x=4 is a vertical line? my email address is: angeleyessix@aol.com Thank you so much.

Question 307165: Can you tell me why line x=4 is a vertical line?
my email address is: angeleyessix@aol.com
Thank you so much.

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
The x-axis is horizontal.
The y-axis is vertical.
If you connect two points that have the same x value, (4,0) and (4,8) for instance.
The line will be parallel to the y-axis because the x value does not change. Since the lines are parallel, then the line x=4 is also vertical.

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