document.write( "Question 349605: if the graph of the equation ax + 3y =9 is perpendiculer to 3x + y =-4 whats the value of a \n" ); document.write( "

Algebra.Com's Answer #249877 by Fombitz(32388) $\"\"$ $\"About$

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Find the slope of each line by convert to slope-intercept form, $\"y=mx%2Bb\"$ .
\n" ); document.write( " $\"ax%2B3y=9\"$
\n" ); document.write( " $\"3y=-ax%2B9\"$
\n" ); document.write( " $\"y=-%28a%2F3%29x%2B3\"$
\n" ); document.write( " $\"m1=-%28a%2F3%29\"$
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\n" ); document.write( " $\"3x%2By=-4\"$
\n" ); document.write( " $\"y=3x-4\"$
\n" ); document.write( " $\"m2=3\"$
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\n" ); document.write( "Perpendicular lines have slopes that are negative reciprocals,
\n" ); document.write( " $\"m1%2Am2=-1\"$
\n" ); document.write( " $\"-%28a%2F3%29%2A3=-1\"$
\n" ); document.write( " $\"highlight%28a=1%29\"$
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\n" ); document.write( " $\"graph%28300%2C300%2C-10%2C10%2C-10%2C10%2C-%281%2F3%29x%2B3%2C3x-4%29\"$ \n" ); document.write( "

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