document.write( "Question 138195: I also have to set up a three equation problem as well but once again I don't understand it.\r
\n" ); document.write( "\n" ); document.write( "If the second number is subtracted from the sum of the first number and 2 times the third number, the result is 1. The thrid number plus 2 times the first number is 3. The first number plus 3 times the second number plus the third number is 18. Find the three numbers. \r
\n" ); document.write( "\n" ); document.write( "Thank you for your help.
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Algebra.Com's Answer #100908 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
If the second number is subtracted from the sum of the first number and 2 times the third number, the result is 1.
\n" ); document.write( "a+2c-b = 1
\n" ); document.write( "-----------------
\n" ); document.write( "The third number plus 2 times the first number is 3.
\n" ); document.write( "c +2a = 3
\n" ); document.write( "---------------------
\n" ); document.write( "The first number plus 3 times the second number plus the third number is 18.
\n" ); document.write( "a+3b+c = 18
\n" ); document.write( "------------------------------
\n" ); document.write( "Find the three numbers.
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\n" ); document.write( "Rearrange the equations:
\n" ); document.write( "a - b + 2c = 1
\n" ); document.write( "2a + 0 + c = 3
\n" ); document.write( "a + 3b + c = 18
\n" ); document.write( "-------------------------
\n" ); document.write( "Using Matrix methods I get:
\n" ); document.write( "a= 0
\n" ); document.write( "b= 5
\n" ); document.write( "c= 3
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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