document.write( "Question 394654: If the third term of an arithmetic sequence is 14 and the eighth term is -1, find the values of a1 and d of the sequence.
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Algebra.Com's Answer #279987 by ewatrrr(24785)\"\" \"About 
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document.write( "Hi\r
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document.write( "\"a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad\"
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document.write( "\"a%5B3%5D=a%5B1%5D%2B2%2Ad=+14\"
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document.write( "\"a%5B8%5D=a%5B1%5D%2B7%2Ad=+-1\"
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document.write( "        -5d = 15      |subtracting 2nd equation from 1st to eliminate \"a%5B1%5D\"
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document.write( "          d = -3
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document.write( " \"a%5B1%5D+-6+=+14\"   |substituting d into \"a%5B1%5D%2B2%2Ad=+14\"
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document.write( "    \"a%5B1%5D+=+20\"\r
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document.write( "CHECKING our Answer
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document.write( "\"a%5B8%5D=20+%2B+7%2A%28-3%29=+-1\"
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