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)![]() ![]() ![]() You can put this solution on YOUR website! 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 \n" ); document.write( " \n" ); document.write( " |