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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