document.write( "Question 508510: i was given this example to work with...\r
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document.write( "\"if 3 apples and 2 pears cost $6.00 and 7 apples and 6 pears cost $15.00, how much will one apple and one pear cost?\" \r
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document.write( "given solution: \r
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document.write( "3a+2p=6.00
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document.write( "7a+6p=15.00\r
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document.write( "\"because these two equations do not have the same 'y' value, they must be changed in order to eliminate one of the variables.\"\r
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document.write( "(this is where i ran into trouble)\r
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document.write( "-3(3a+2p=6.00)=-9a - 6p=-18.00\r
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document.write( "(everything i understand perfectly up until this point. i just dont how to come to the '-3' there infront of the sum. where did it come from? and how do i know whether its even suppose to be a negative or a three for that matter? please please any help would be greatly appreciated. my final graduating year depends on my completing this last book.)\r
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Algebra.Com's Answer #341027 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! if 3 apples and 2 pears cost $6.00 and 7 apples and 6 pears cost $15.00, how much will one apple and one pear cost?\" \n" ); document.write( "given solution: \n" ); document.write( "3a+2p=6.00 \n" ); document.write( "7a+6p=15.00 \n" ); document.write( "\"because these two equations do not have the same 'y' value, they must be changed in order to eliminate one of the variables.\" \n" ); document.write( "(this is where i ran into trouble) \n" ); document.write( "-3(3a+2p=6.00)=-9a - 6p=-18.00 \n" ); document.write( "----------------- \n" ); document.write( "3a+2p=600 \n" ); document.write( "7a+6p=1500 \n" ); document.write( "Multiply the 1st eqn by -3 \n" ); document.write( "-9a - 6p = -1800 \n" ); document.write( "+7a + 6p = 1500 \n" ); document.write( "----------------- Add \n" ); document.write( "-2a = -300 \n" ); document.write( "a = 150 cents, etc. \n" ); document.write( "========================= \n" ); document.write( "You were doing the right thing, just didn't finish it.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |