document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=683633>Question 683633</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a + 3b = 1,<BR>\n" );
document.write( "2a - b = 1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #423634 by </B><A HREF=/tutors/aboutme.mpl?userid=tsewaitung><B>tsewaitung(11)</B></A><img src=\"/images/stars/stars-06.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tsewaitung><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=423634\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a+3b=1----------(1)<BR>\n" );
document.write( "2a-b=1----------(2)<BR>\n" );
document.write( "from (2), we have<BR>\n" );
document.write( " 2a-b=1<BR>\n" );
document.write( "   2a=1+b<BR>\n" );
document.write( " 2a-1=b---------(3)<BR>\n" );
document.write( "by substituting (3) into (1), we have<BR>\n" );
document.write( "a+3(2a-1)=1<BR>\n" );
document.write( "   a+6a-3=1<BR>\n" );
document.write( "       7a=4<BR>\n" );
document.write( "        <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=4%2F7 ALIGN=MIDDLE  ALT=\"a=4%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "by substituting a=4/7 into (3), we have<BR>\n" );
document.write( "2(4/7)-1=b<BR>\n" );
document.write( "       b=8/7-1<BR>\n" );
document.write( "       <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=1%2F7 ALIGN=MIDDLE  ALT=\"b=1%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );