document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=666496>Question 666496</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the method of substitution to solve the system of linear equations.\r<BR>\n" );
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document.write( "7a = 3 - b<BR>\n" );
document.write( "7a = 5 - b\r<BR>\n" );
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document.write( "How many solutions 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 #414584 by </B><A HREF=/tutors/aboutme.mpl?userid=lynnlo><B>lynnlo(4176)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lynnlo><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=414584\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> EXAMPLE FOR YOU TO STUDY SO YOU CAN UNDERSTAND<BR>\n" );
document.write( " SUBSTITUTION METHOD<BR>\n" );
document.write( "     -Y=2X+4<BR>\n" );
document.write( "      3X+Y=9<BR>\n" );
document.write( "SUBSTITUTE Y IN SECOND EQUATION<BR>\n" );
document.write( "3X+Y=9<BR>\n" );
document.write( "3X+(2X+4)=9<BR>\n" );
document.write( "5X+4=9<BR>\n" );
document.write( "5X=5<BR>\n" );
document.write( "X=1<BR>\n" );
document.write( "YOU CAN USE THE VALUE OF X TO FIND Y BY SUBSTITUTING<BR>\n" );
document.write( "                             IN THE FIRST EQUATION<BR>\n" );
document.write( "Y=2X+4<BR>\n" );
document.write( "Y=2*1+4<BR>\n" );
document.write( "Y=6<BR>\n" );
document.write( " ========SOLUTION IS (1,6) </SPAN>\n" );
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