document.write( "Question 524097: Why the line x=4 is a vertical line \n" ); document.write( "
Algebra.Com's Answer #347554 by Alan3354(69443)\"\" \"About 
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Why the line x=4 is a vertical line
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\n" ); document.write( "For all values of y, x=4. It's parallel to the y-axis.
\n" ); document.write( "That's often referred to as \"vertical\", but that can change if you have a 3-space system.
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