document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1181194>Question 1181194</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A mathematics teacher buys some books for her A-Level and IGCSE students. A-Level books cost $10 each and IGCSE books $15 each. She spends a total of $1800, buying a total of 160 books in all.\r<BR>\n" );
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document.write( "1) Write two simultaneous equations to express this information, defining your symbols clearly.\r<BR>\n" );
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document.write( "2) Solve your equations to find out how many of each type of book she buys. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #811066 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=811066\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A-level is x<BR>\n" );
document.write( "IGCSE is y<BR>\n" );
document.write( "x+y=160<BR>\n" );
document.write( "10x+15y=1800<BR>\n" );
document.write( "-10x-10y=-1600, multiplying the top by -10<BR>\n" );
document.write( "5y=200<BR>\n" );
document.write( "y=40 books( IGCSE) that are $15 each or $600<BR>\n" );
document.write( "x=120 books (A-level) that are $10 each or $1200<BR>\n" );
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