document.write( "Question 262127: why the line x = 4 is a vertical line. \r
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Algebra.Com's Answer #193111 by Alan3354(69443)\"\" \"About 
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For any value of y, x = 4. That makes it parallel to the y-axis, which is commonly referred to as vertical.
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\n" ); document.write( "The line is always 4 units to the right of the y-axis.\r
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