document.write( "Question 476432: determine whether the lines are perpendicular
\n" ); document.write( "y=x+4, y=x-4 \n" ); document.write( "

Algebra.Com's Answer #326764 by Tatiana_Stebko(1539) $\"\"$ $\"About$

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Perpendicular lines are lines whose slopes are negative reciprocals of one another, $\"m%5B1%5D%2Am%5B2%5D=-1\"$
\n" ); document.write( "The slope of the line $\"y=x%2B4\"$ is $\"m%5B1%5D=1\"$
\n" ); document.write( "The slope of the line $\"y=x-4\"$ is $\"m%5B2%5D=1\"$
\n" ); document.write( "Then $\"m%5B1%5D%2Am%5B2%5D=1%2A1=1\"$ not $\"-1\"$
\n" ); document.write( "The lines are not perpendicular \n" ); document.write( "

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