document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1030737>Question 1030737</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a girl bought 20 first-class stamps and 10 postcard stamps for $11.10. another day she spent $24.50 on 40 first-class stamps and 30 postcard stamps. find the cost of each type of stamp </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #645555 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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/cgi-bin/show-face.mpl?user=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=645555\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi there,<BR>\n" );
document.write( "Make first class stamps = x<BR>\n" );
document.write( "and postcard stamps = y<BR>\n" );
document.write( "20x + 10y = 1110.......(1)<BR>\n" );
document.write( "40x + 30y = 2450.......(2)<BR>\n" );
document.write( "Multiply Eq(1) by 3<BR>\n" );
document.write( "60x + 30y = 3330.......(1)<BR>\n" );
document.write( "40x + 30y = 2450.......(2)<BR>\n" );
document.write( "Subtract Eq(2) from Eq(1)<BR>\n" );
document.write( "20x   =  880<BR>\n" );
document.write( "x = 44<BR>\n" );
document.write( "Substitute x = 44 into Eq(2)<BR>\n" );
document.write( "40x + 30y = 2450.......(2)<BR>\n" );
document.write( "40(44) + 30y = 2450<BR>\n" );
document.write( "1760 + 30y = 2450<BR>\n" );
document.write( "30y = 2450 - 1760<BR>\n" );
document.write( "30y = 690<BR>\n" );
document.write( "y = 23.<BR>\n" );
document.write( "First class stamps cost $0.44<BR>\n" );
document.write( "Postcard stamps cost $0.23<BR>\n" );
document.write( "Hope this helps :-) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );