document.write( "Question 1126473: is y=-7/8x+3 and -7y=-8x perpendicular \n" ); document.write( "

Algebra.Com's Answer #742789 by MathLover1(20850) $\"\"$ $\"About$

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to see is $\"y=-%287%2F8%29x%2B3+\"$ and $\"-7y=-8x\"$ perpendicular, first write $\"-7y=-8x\"$ in slope-intercept form\r
\n" ); document.write( "\n" ); document.write( " $\"y=%28-8%2F-7%29x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=%288%2F7%29x\"$ \r
\n" ); document.write( "\n" ); document.write( "compare their slopes:\r
\n" ); document.write( "\n" ); document.write( " $\"y=-highlight%28%287%2F8%29%29x%2B3+\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=highlight%28%288%2F7%29%29x\"$ \r
\n" ); document.write( "\n" ); document.write( "as you can see, $\"highlight%28%288%2F7%29%29\"$ is negative reciprocal of $\"-highlight%28%287%2F8%29%29\"$ \r
\n" ); document.write( "\n" ); document.write( "or $\"highlight%28%288%2F7%29%29=-1%2Fhighlight%28-%287%2F8%29%29\"$ \r
\n" ); document.write( "\n" ); document.write( "by definition, lines are perpendicular $\"if\"$ their slopes are negative reciprocal to each other\r
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