document.write( "Question 843415: Three pens and two notebooks cost $10.05. Two pens and three notebooks cost $10.45. How much would two pens and two notebooks cost? \n" ); document.write( "
Algebra.Com's Answer #508229 by LinnW(1048)\"\" \"About 
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set p = price of pen
\n" ); document.write( " n = price of notebook
\n" ); document.write( "3p + 2n = 10.05
\n" ); document.write( "2p + 3n = 10.45
\n" ); document.write( "multiply top by 2 and bottom by -3
\n" ); document.write( "6p + 4n = 20.10
\n" ); document.write( "-6p -9n = -31.35
\n" ); document.write( "add equations
\n" ); document.write( "-5n = -11.25
\n" ); document.write( "divide each side by -5
\n" ); document.write( "n = 2.25
\n" ); document.write( "Substitute 2.25 for n in 3p + 2n = 10.05
\n" ); document.write( "3p + 2(2.25) = 10.05
\n" ); document.write( "3p + 4.50 = 10.05
\n" ); document.write( "add -4.50 to each side
\n" ); document.write( "3p = 5.55
\n" ); document.write( "p = 1.85
\n" ); document.write( " \n" ); document.write( "
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