document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=314621>Question 314621</A>: <I><SPAN STYLE=\"word-break: break-all;\"> SOLVE SYSTEM EQUATION BY SUBSTITUTION.<BR>\n" );
document.write( "4X+Y=18<BR>\n" );
document.write( "   y=2x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #224992 by </B><A HREF=/tutors/aboutme.mpl?userid=rapaljer><B>rapaljer(4671)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rapaljer><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=rapaljer><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=224992\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Substitute the y=2x back into the first equation:<BR>\n" );
document.write( "4x+y=18<BR>\n" );
document.write( "4x+(   )=18<BR>\n" );
document.write( "4x+(2x)=18<BR>\n" );
document.write( "6x=18<BR>\n" );
document.write( "x=3\r<BR>\n" );
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document.write( "Now find y using the y=2x equation:<BR>\n" );
document.write( "y=2x<BR>\n" );
document.write( "y=2(3)<BR>\n" );
document.write( "y=6\r<BR>\n" );
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document.write( "Check in the other equation:<BR>\n" );
document.write( "4x+y=18<BR>\n" );
document.write( "4*3+6=18<BR>\n" );
document.write( "It checks.\r<BR>\n" );
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document.write( "For additional explanation on this topic, please see my own website.  Click on my tutor name \"rapaljer\" and then click on the link that is given there.  From my Homepage, look for the link \"Basic, Intermediate, and College Algebra: One Step at a Time.\"  Select \"Basic Algebra,\" and look for \"Chapter 4\", Section 4.07 Systems of Equations.\"  These sections include my own explanation written especially for students who may have trouble understanding these skills, examples, exercises, and ALL the answers.  Many of the exercises are solved in detail on the \"Math in Living Color\" pages that go with these pages.\r<BR>\n" );
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document.write( "Dr. Robert J. Rapalje, Retired<BR>\n" );
document.write( "Seminole State College of Florida<BR>\n" );
document.write( "Altamonte Springs Campus </SPAN>\n" );
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