document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=583424>Question 583424</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve by the substitution method<BR>\n" );
document.write( "15x-20y=-1<BR>\n" );
document.write( "10y=1+5x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #372438 by </B><A HREF=/tutors/aboutme.mpl?userid=unlockmath><B>unlockmath(1688)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=unlockmath><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=unlockmath><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=372438\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hello, <BR>\n" );
document.write( "Let's solve this by getting the second equation to equal x as follows:<BR>\n" );
document.write( "15x-20y=-1<BR>\n" );
document.write( "2y-1/5=x<BR>\n" );
document.write( "Now substitute:<BR>\n" );
document.write( "15(2y-1/5)-20y=-1<BR>\n" );
document.write( "Rewritten as:<BR>\n" );
document.write( "30y-3-20y=-1<BR>\n" );
document.write( "Combine like terms and add3:<BR>\n" );
document.write( "10y=2<BR>\n" );
document.write( "y=1/5<BR>\n" );
document.write( "Plug that into the first equation to get: <BR>\n" );
document.write( "x=1/5<BR>\n" );
document.write( "Make sense?<BR>\n" );
document.write( "RJ<BR>\n" );
document.write( "www.math-unlock.com </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );