document.write( "Question 501705: A man bought 9 pounds of coffee and 6 pounds of butter for a total of $42.75
\n" ); document.write( "A day later, the prices had not changed and he bought 10 pounds of coffee and 14 pounds of butter for $64.00
\n" ); document.write( "Find the price per pound of the butter.''.\r
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Algebra.Com's Answer #338623 by mananth(16946)\"\" \"About 
You can put this solution on YOUR website!
coffee x $/kg
\n" ); document.write( "butter y $/kg
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\n" ); document.write( "9 x + 6 y = 42.75 .............1
\n" ); document.write( "10 x + 14 y = 64 .............2
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -14
\n" ); document.write( "Multiply (2) by 6
\n" ); document.write( "-126 x -84 y = -598.5
\n" ); document.write( "60 x 84 y = 384
\n" ); document.write( "Add the two equations
\n" ); document.write( "-66 x = -214.5
\n" ); document.write( "/ -66
\n" ); document.write( "x = 3.25 OR 3 1/ 4
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "9 x + 6 y = 42.75
\n" ); document.write( "29.25 + 6 y = 42.75
\n" ); document.write( " 6 y = 42.75 -29.25
\n" ); document.write( " 6 y = 13.5
\n" ); document.write( " y = 2.25 OR 2 1/4
\n" ); document.write( "coffee 3 1/4 $/kg
\n" ); document.write( "butter 2 1/4 $/kg
\n" ); document.write( "m.ananth@hotmail.ca
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