Posted by Lavern on Friday, December 2, 2011 at 11:12pm.
why is the line x=4 is a vertical line.

Math equation  Reiny, Saturday, December 3, 2011 at 12:20am
The equation says x = 4, it says nothing about the y
so any point with an x value of 4 will do, and y can be anything.
e.g. (4,1) , (4,4), (4 3)
plot these points and see what you get
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