raniat123 Posted August 6, 2013 Share Posted August 6, 2013 [ATTACH=CONFIG]6824[/ATTACH]Please Help Quote Link to comment Share on other sites More sharing options...
gbd97 Posted August 6, 2013 Share Posted August 6, 2013 http://www.www.urch.com/forums/attachments/gre-math/6824-urgent-taking-test-8-9-need-help-line-equation-7.jpgPlease Help Hi, To get the equation of a perpendicular line , lets assume, an equation y=mx+b where m is the slope To get any the equation of the perpendicular line of this equation, you should know that for perpendicular line, the slope is=-1/m So the equation of the line in your mentioned question is y=x that means slope, m=1 so any perpendicular line in this equation should have a slope of 1/-1=-1 only C,D has slope -1, so they are the answer! GM EXPLORE GRE Quote Link to comment Share on other sites More sharing options...
gbd97 Posted August 7, 2013 Share Posted August 7, 2013 I answered all of your questions, but some of the answers are not yet approved by admin for perpendicular , slope is -1/m where m is the slope of the given line so here slope m =1 so perpendicular slope=-1/1=-1 only C, D has -1 slope, so that is the answer.... Quote Link to comment Share on other sites More sharing options...
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