document.write( "Question 139329: How can you determine if two lines are perpindicular? \n" ); document.write( "
Algebra.Com's Answer #101593 by vleith(2983)\"\" \"About 
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Find their slopes. Then see if those slopes, when multiplied together, equal -1. \r
\n" ); document.write( "\n" ); document.write( "If they do, the lines are Perp. If not, then lines are not Perp.
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