document.write( "Question 1150756: The third term of an a.p is 4x-2y and the 9th term is 10x -8y.find the common difference \n" ); document.write( "

Algebra.Com's Answer #772211 by greenestamps(13330) $\"\"$ $\"About$

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\n" ); document.write( "Expressing the third and ninth terms in terms of the first term and common difference, as both the other tutors did, adds unnecessary steps (and time) to finding the solution.

\n" ); document.write( "The ninth term is the third term, plus 9-3=6 times the common difference:

\n" ); document.write( " $\"10x-8y+=+%284x-2y%29%2B6d\"$
\n" ); document.write( " $\"%2810x-8y%29-%284x-2y%29+=+6d\"$
\n" ); document.write( " $\"6x-6y+=+6d\"$
\n" ); document.write( " $\"d+=+x-y\"$

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