document.write( "Question 486346: Bronze which costs $9.10/kg is made by
\n" ); document.write( "combining copper which costs $8.90/kg with
\n" ); document.write( "tin which costs $9.50/kg. Find the number
\n" ); document.write( "of kg of copper and tin required to make
\n" ); document.write( "15.3 kg of bronze. \n" ); document.write( "
Algebra.Com's Answer #332429 by mananth(16946)\"\" \"About 
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Copper x kg-------- $8.9
\n" ); document.write( "Tin y kg--------$9.5
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\n" ); document.write( "1 x + 1 y = 15.3 .............1
\n" ); document.write( "8.9 x + 9.5 y = 139.23 .............2 (9.1*15.3)
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -9.5
\n" ); document.write( "Multiply (2) by 1
\n" ); document.write( "-9.5 x -9.5 y = -145.35
\n" ); document.write( "8.9 x 9.5 y = 139.23
\n" ); document.write( "Add the two equations
\n" ); document.write( "-0.6 x = -6.12
\n" ); document.write( "/ -0.6
\n" ); document.write( "x = 10.20 kg
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "1 x + 1 y = 15.3
\n" ); document.write( "10.2 + 1 y = 15.3
\n" ); document.write( " 1 y = 15.3 -10.2
\n" ); document.write( " 1 y = 5.1
\n" ); document.write( " y = 5.10kg
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