document.write( "Question 1206282: A store is having a sale on trail mix and jelly beans. For 2 pounds of trail mix and 3 pounds of jelly beans, the total cost is 14 $. For 6 pounds of trail mix and 5 pounds of jelly beans, the total cost is 28$ . Find the cost for each pound of trail mix and each pound of jelly beans.
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Algebra.Com's Answer #843604 by math_tutor2020(3817)![]() ![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "x = cost of 1 pound of trail mix \n" ); document.write( "y = cost of 1 pound of jelly beans\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The given sentences translate to the following system \n" ); document.write( "2x+3y = 14 \n" ); document.write( "6x+5y = 28\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Let's triple both sides of the 1st equation \n" ); document.write( "2x+3y = 14 \n" ); document.write( "3*(2x+3y) = 3*14 \n" ); document.write( "6x+9y = 42\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The original system updates to this \n" ); document.write( "6x+9y = 42 \n" ); document.write( "6x+5y = 28\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Subtract straight down. \n" ); document.write( "The x terms cancel out. \n" ); document.write( "The y terms subtract to 4y. \n" ); document.write( "The right hand sides subtract to 14\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Solving 4y = 14 leads to y = 3.50 \n" ); document.write( "Then use that value of y to find x. \n" ); document.write( "2x+3y = 14 \n" ); document.write( "2x+3*3.5 = 14 \n" ); document.write( "2x+10.5 = 14 \n" ); document.write( "2x = 14-10.5 \n" ); document.write( "2x = 3.5 \n" ); document.write( "x = 3.5/2 \n" ); document.write( "x = 1.75\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Answers: \n" ); document.write( "Cost of one pound of trail mix = $1.75 \n" ); document.write( "Cost of one pound of jelly beans = $3.50 \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " |