document.write( "Question 255881: You buy 3 pencils and 1 pen for $1.75. You buy 2 pencils and 2 pens for $2.50. How much will 5 pencils cost? \n" ); document.write( "
Algebra.Com's Answer #188119 by checkley77(12844)\"\" \"About 
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3x+1y=1.75 muliply by -2 & add.
\n" ); document.write( "2x+2y=2.50
\n" ); document.write( "-6x-2y=-3.50
\n" ); document.write( "----------------
\n" ); document.write( "-4x=-1.00
\n" ); document.write( "x=-1.00/-4
\n" ); document.write( "x=$.25 cost of 1 pencil.
\n" ); document.write( "3*.25+y=1.75
\n" ); document.write( ".75+y=1.75
\n" ); document.write( "y=1.75-.75
\n" ); document.write( "y=$1.00 cost of i pen.
\n" ); document.write( "Proof:
\n" ); document.write( "2*.25+2*1.00=2.50
\n" ); document.write( ".50+2.00=2.50
\n" ); document.write( "2.50=2.50
\n" ); document.write( "5*.25=$1.25 is the cost of 5 pencils.
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