SOLUTION: why the line x=4 is a vertical line?

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Question 314286: why the line x=4 is a vertical line?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
The line x = 4 is parallel with the y-axis.
This means that the value of the y-coordinate in the form (x,y) changes while the x-coordinate remains the same as x = 4 without end.
Also, vertical lines have NO SLOPE. So, the line x = 4 has no slope.