document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=387215>Question 387215</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Tyrel and dalia bought some pens and pencils. Tyrel bought 4 pens and 5 pencils which cost her $6.71... Dalia bought 5 pens and 3 pencils which cost her $7.12.... let a equal the cost of one pen and let b eual the cost of one pencil </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #273686 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=273686\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Tyrel and dalia bought some pens and pencils. <BR>\n" );
document.write( "Tyrel bought 4 pens and 5 pencils which cost her $6.71... <BR>\n" );
document.write( "Dalia bought 5 pens and 3 pencils which cost her $7.12.... <BR>\n" );
document.write( "let a equal the cost of one pen and let b equal the cost of one pencil<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "4a + 5b = 671 cents<BR>\n" );
document.write( "5a + 3b = 712 cents<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Multiply 1st by 5<BR>\n" );
document.write( "Multiply 2nd by 4<BR>\n" );
document.write( "------<BR>\n" );
document.write( "20a + 25b = 5*671<BR>\n" );
document.write( "20a + 12b = 4*712<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Subtract 2nd from 1st and solve for \"b\":<BR>\n" );
document.write( "13b = 507<BR>\n" );
document.write( "b = 39 cents (price of one pencil)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Substitute into 4a+5b = 671 to solve for \"a\":<BR>\n" );
document.write( "4a + 5*39 = 671<BR>\n" );
document.write( "4a = 476<BR>\n" );
document.write( "a = 119 cents (price of one pen)<BR>\n" );
document.write( "=====================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );