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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