document.write( "Question 529742: Is the line through points P(–8, –10) and Q(–5, –12) perpendicular to the line through points R(9, –6) and S(17, –5)? Explain. \n" ); document.write( "

Algebra.Com's Answer #349687 by solver91311(24713) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "Use the slope formula\r
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\n" ); document.write( "\n" ); document.write( "where

and

are the coordinates of the given points P and Q.\r
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\n" ); document.write( "\n" ); document.write( "Then do it again for points R and S.\r
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\n" ); document.write( "\n" ); document.write( "If the slope of the line through P and Q is the negative reciprocal of the slope of the line through R and S, then the lines are perpendicular. Otherwise, not.\r
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\n" ); document.write( "\n" ); document.write( "John
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\n" ); document.write( "My calculator said it, I believe it, that settles it
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$\"The$

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