document.write( "Question 964541: if the line passing through the points (2,a) and (5,-3) is parallel to the line passing through the points (4,8) and (-5,a+1), what is the value of a? \n" ); document.write( "

Algebra.Com's Answer #589443 by Fombitz(32388) $\"\"$ $\"About$

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Parallel lines have identical slopes.
\n" ); document.write( "Find the slope for each line.
\n" ); document.write( " $\"m%5B1%5D=%28-3-a%29%2F%285-2%29=-%28a%2B3%29%2F3\"$
\n" ); document.write( " $\"m%5B2%5D=%28a%2B1-8%29%2F%28-5-4%29=+-%28a-7%29%2F%289%29+\"$
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\n" ); document.write( " $\"m%5B1%5D=m%5B2%5D\"$
\n" ); document.write( " $\"-%28a%2B3%29%2F3=-%28a-7%29%2F%289%29\"$
\n" ); document.write( " $\"9%28a%2B3%29=3%28a-7%29\"$
\n" ); document.write( " $\"9a%2B27=3a-21\"$
\n" ); document.write( " $\"6a=-48\"$
\n" ); document.write( " $\"a=-8\"$ \r
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