document.write( "Question 162120: sue bought 4 pounds of coffee and two pounds of tea for $31.50 last week. this week she bought 3 pounds of coffee and 4 pounds of tea for $38.25. what is the cost per pound of both the coffee and tea? \n" ); document.write( "
Algebra.Com's Answer #119491 by checkley77(12844)\"\" \"About 
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4c+2t=31.50 multiply this equation by -2 & add.
\n" ); document.write( "3c+4t=38.50
\n" ); document.write( "-8c-4t=-63
\n" ); document.write( "----------------------
\n" ); document.write( "-5c=-24.5
\n" ); document.write( "c=-24.5/-5
\n" ); document.write( "c=$4.90 price for a pound of coffee.9
\n" ); document.write( "4*4.90+2t=31.50
\n" ); document.write( "19.6+2t=31.50
\n" ); document.write( "2t=31.50-19.6
\n" ); document.write( "2t=11.90
\n" ); document.write( "t=11.90/2
\n" ); document.write( "t=$5.95 price for a pound of tea.
\n" ); document.write( "Proof:
\n" ); document.write( "3*4.90+4*5.95=38.50
\n" ); document.write( "14.70+23.8=38.50
\n" ); document.write( "38.5=38.5
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