Algebra.Com's Answer #176418 by Edwin McCravy(20055)![\"\"](\"/images/stars/stars-13.gif\")  
You can put this solution on YOUR website!
find the slope. through (4,-2) and parallel to x=1
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document.write( "That's a vertical line, and it has NO slope!\r\n" );
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document.write( "All equations of the form \r\n" );
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document.write( "x = a\r\n" );
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document.write( "are vertical lines which are \" a \" units from the y-axis.\r\n" );
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document.write( "The vertical line whose equation is x = 1 is this green\r\n" );
document.write( "line below:\r\n" );
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document.write( "The point (4,-2) is this point plotted below:\r\n" );
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document.write( "The line parallel to the vertical line whose\r\n" );
document.write( "equation is x = 1 which goes through the point\r\n" );
document.write( "(4,-2) is the blue vertical line below:\r\n" );
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document.write( "Its equation is x = 4. But neither line has a slope.\r\n" );
document.write( "Vertical lines are the only kind of lines which have no slope.\r\n" );
document.write( "All other lines have slopes.\r\n" );
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document.write( "Edwin \n" );
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