document.write( "Question 955093: Are the lines through the pairs of points perpendicular:\r
\n" ); document.write( "\n" ); document.write( "!(10,1),B(-10,2) and C(10,-9), D(-6,3)
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Algebra.Com's Answer #583388 by Fombitz(32388)\"\" \"About 
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Find the slopes.
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\n" ); document.write( "\"m%5B2%5D=%283-%28-9%29%29%2F%28-6-10%29=12%2F%28-16%29=-%283%2F4%29\"
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\n" ); document.write( "Perpendicular lines have slopes that are negative reciprocals,
\n" ); document.write( "\"-%281%2F20%29%2A%28-%283%2F4%29%29%3C%3E+-1\"
\n" ); document.write( "No, these lines are not perpendicular.
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