document.write( "Question 1106191: Mary bought 6 new compact disks and 2 used compact disks for $127.92. At the same prices, Neal bought 3 new compact disks and 8 used compact disks for $133.89. Find the cost of buying a single used compact disk. \n" ); document.write( "

Algebra.Com's Answer #721135 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a+\"$ = the cost of a single new CD
\n" ); document.write( "Let $\"+b+\"$ = the cost of a single used CD
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\n" ); document.write( "(1) $\"+6a+%2B+2b++=+127.92+\"$
\n" ); document.write( "(2) $\"+3a+%2B+8b+=+133.98+\"$
\n" ); document.write( "-----------------------------
\n" ); document.write( "Multiply both sides of (1) by $\"+4+\"$
\n" ); document.write( "and subtract (2) from (1)
\n" ); document.write( "You can finish
\n" ); document.write( " \n" ); document.write( "

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