document.write( "Question 1004760: If a student spent $68 dollars in cards. A stack of cards A are $4 each and a stack of B cards are $7 each. If the student bought 11 stack of cards, how many stacks of A and B were purchased? \n" ); document.write( "
Algebra.Com's Answer #622122 by fractalier(6550) You can put this solution on YOUR website! From the facts we have \n" ); document.write( "4A + 7B = 68 and \n" ); document.write( "A + B = 11 \n" ); document.write( "Multiply the bottom one by 4 and subtract from the top one and get \n" ); document.write( "4A + 7B = 68 \n" ); document.write( "-(4A + 4B = 44) \n" ); document.write( "---------------- \n" ); document.write( "3B = 24 \n" ); document.write( "B = 8 stacks of B \n" ); document.write( "A = 3 stacks of A \n" ); document.write( " |