document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=29018>Question 29018</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have to do some problems like these two. Can anyone help me threw the steps on both of these so that I know how to do them.\r<BR>\n" );
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document.write( "example 1\r<BR>\n" );
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document.write( "Solve the system.<BR>\n" );
document.write( "	x + y = 9<BR>\n" );
document.write( "	x – y = 3\r<BR>\n" );
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document.write( "Example 2\r<BR>\n" );
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document.write( "Solve the system by addition.<BR>\n" );
document.write( "	–4x + 5y = 1<BR>\n" );
document.write( "	 x – 4y = 19\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #15850 by </B><A HREF=/tutors/aboutme.mpl?userid=wuwei96815><B>wuwei96815(245)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=wuwei96815><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=15850\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> These types of problems are best solve using elimination and substitution.\r<BR>\n" );
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document.write( "In the elimination part we have to eliminate one of the varibles so that we can solve for the other.  When we add x+y=9 and x-y=3, we get 2x =12.  What happened to the y's?  They were eliminated (y-y=0).  Now you can easily solve for x.<BR>\n" );
document.write( "2x = 12<BR>\n" );
document.write( "x = 6\r<BR>\n" );
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document.write( "Since we have the value of one of the variables, we can use substituion to find the other.<BR>\n" );
document.write( "x+y=9<BR>\n" );
document.write( "(6)+ y = 9<BR>\n" );
document.write( "y=9+6 = 15\r<BR>\n" );
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document.write( "The second problem is more difficult because simply adding the equations together will not eliminate either variable.  In the second problem try multiplying the second equation by 4 and then proceeding.  Let me know how you make out. </SPAN>\n" );
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