Posted by **Terri** on Friday, October 9, 2009 at 12:00pm.

Could someone please explain to me why the line x=4 is a vertical line.

Thank you.

- Algebra -
**drwls**, Friday, October 9, 2009 at 12:19pm
Because x has to be 4 while y can be anything. A vertical line through (4,0)contains all points for which x=4.

- Algebra -
**Reiny**, Friday, October 9, 2009 at 12:27pm
Pick any two ordered pairs that satisfy the equation, remember all it said was x = 4

how about (4,0) and (4,5) ? Do they satisfy our condition that x = 4 ?

Plot the points and draw the line.

Mmmmhhh ?

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