document.write( "Question 472863: Is the line through points P(1, 9) and Q(9, 6) perpendicular to the line through points R(-6, 0) and S(-9, 8)? Explain.\r
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\n" ); document.write( "b. No; their slopes are not opposite reciprocals.
\n" ); document.write( "c. No; their slopes are not equal
\n" ); document.write( "d. Yes; their slopes are equal \n" ); document.write( "
Algebra.Com's Answer #324194 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
 
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document.write( "Hi,
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document.write( "Is the line through points P(1, 9) and Q(9, 6) perpendicular to the line
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document.write( " through points R(-6, 0) and S(-9, 8)?
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document.write( "Using the point-slope formula, \"m+=%28y%5B2%5D+-+y%5B1%5D%29%2F%28x%5B2%5D+-+x%5B1%5D%29\"
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document.write( "P(1, 9) and 
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document.write( "Q(9, 6)     m = 3/-8 = -3/8\r
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document.write( "R(-6, 0) and 
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document.write( "S(-9, 8)    m = -8/3 
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document.write( "b. No; their slopes are not opposite reciprocals. 
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document.write( "(their slopes are only reciprocals-same sign) 
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