document.write( "Question 1036199: The difference between the tenth term and the seventh term of an arithmetic sequence is -60. The twelfth term divided by the sixth term is 2. Find the first term and the common difference. \n" ); document.write( "
Algebra.Com's Answer #650836 by robertb(5830)\"\" \"About 
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From the given, \"a%5B10%5D+-+a%5B7%5D+=+-60\" and \"a%5B12%5D%2Fa%5B6%5D+=+2\".\r
\n" ); document.write( "\n" ); document.write( "The first equation becomes \"a%5B1%5D+%2B9d+-+%28a%5B1%5D%2B6d%29+=+-60\" ==> 3d = -60 ==> d = -20.\r
\n" ); document.write( "\n" ); document.write( "The second equation becomes \"a%5B12%5D+=+2a%5B6%5D\".\r
\n" ); document.write( "\n" ); document.write( "==> \"a%5B1%5D+%2B+11%2A-20+=+2%28a%5B1%5D+%2B+5%2A-20%29\"\r
\n" ); document.write( "\n" ); document.write( "<==> \"a%5B1%5D+-+220+=+2a%5B1%5D+-+200\"\r
\n" ); document.write( "\n" ); document.write( "==> \"a%5B1%5D+=+-20\"
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