document.write( "Question 106047: Find the slope of any line perpendicular to the line though points (0,5) and (-3,-4) Thank you \n" ); document.write( "
Algebra.Com's Answer #77182 by Fombitz(32388)\"\" \"About 
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To find a line perpendicular to the line going throught the 2 points,
\n" ); document.write( "we need to find its slope first.
\n" ); document.write( "\"m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29\"
\n" ); document.write( "for the two points (0,5) and (-3,-4),
\n" ); document.write( "\"m=%28-4-5%29%2F%28-3-0%29\"
\n" ); document.write( "\"m=%28-9%29%2F%28-3%29\"
\n" ); document.write( "\"m=3\"
\n" ); document.write( "The line going through (0,5) and (-3,-4) has a slope of 3.
\n" ); document.write( "Perpendicular lines have a relationship between their slopes as follows,
\n" ); document.write( "\"m%5B1%5D%2Am%5B2%5D=-1\"
\n" ); document.write( "In this case,
\n" ); document.write( "\"3%2Am%5B2%5D=-1\"
\n" ); document.write( "\"m%5B2%5D=-%281%2F3%29\"
\n" ); document.write( "Therefore your perpendicular line equation is,
\n" ); document.write( "\"y=mx%2Bb\"
\n" ); document.write( "\"y=-%281%2F3%29x\"
\n" ); document.write( "where b=0 for simplicity.
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