document.write( "Question 523649: sue bought 4 packs of cookies and 3 sacks of potato chips for 5.01. Later she bought 3 pack of cookies and 5 sacks of potato chips for 5.27. what is the price of a pack of cookies?
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Algebra.Com's Answer #347362 by oberobic(2304) ![]() You can put this solution on YOUR website! c = cookies \n" ); document.write( "p = potato chips \n" ); document.write( ". \n" ); document.write( "4c + 3p = 501 cents \n" ); document.write( "3c + 5p = 527 cents \n" ); document.write( ". \n" ); document.write( "multiply the first equation by 3 and the second equation by 4 and then subtract \n" ); document.write( ". \n" ); document.write( "12c + 9p = 1503 \n" ); document.write( "12c + 20p = 2108 \n" ); document.write( "------------------ \n" ); document.write( "-11p = -605 \n" ); document.write( ". \n" ); document.write( "p = 55 cents \n" ); document.write( ". \n" ); document.write( "substitute to find 'c' \n" ); document.write( ". \n" ); document.write( "4c + 3(55) = 501 \n" ); document.write( "4c = 501 -165 \n" ); document.write( "4c = 336 \n" ); document.write( ". \n" ); document.write( "c = 84 cents \n" ); document.write( ". \n" ); document.write( "use the other equation to check these values \n" ); document.write( ". \n" ); document.write( "3(84) + 5(55) = 527 \n" ); document.write( ". \n" ); document.write( "Answer: Potato chips cost 55 cents, and cookies cost 84 cents. \n" ); document.write( ". \n" ); document.write( "Done. \n" ); document.write( " |