document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1024617>Question 1024617</A>: <I><SPAN STYLE=\"word-break: break-all;\"> System Of Two Linear Equation Question : A  bookstore sold 18 books for a total of $176 . If some of the books were sold for $7 and some for $12 how many of each are there? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #640027 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=640027\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi there,<BR>\n" );
document.write( "Make $7 books = x<BR>\n" );
document.write( "and $12 books = y<BR>\n" );
document.write( "x + y = 18.......(1)<BR>\n" );
document.write( "7x + 12y = 176...(2)<BR>\n" );
document.write( "Multiply (1) by 12<BR>\n" );
document.write( "12x + 12y = 216....(1)<BR>\n" );
document.write( "7x + 12y = 176.....(2)<BR>\n" );
document.write( "Take Eq(2) from Eq(1)<BR>\n" );
document.write( "5x = 40<BR>\n" );
document.write( "x = 8<BR>\n" );
document.write( "Substitute x = 8 into Eq(1)<BR>\n" );
document.write( "x + y = 18<BR>\n" );
document.write( "8 + y = 18<BR>\n" );
document.write( "y = 18 - 8<BR>\n" );
document.write( "y = 10<BR>\n" );
document.write( "8 x $7 and 10 x $12 books were sold.<BR>\n" );
document.write( "Hope this helps :-) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );