document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=274441>Question 274441</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have a test on this tomarrow. I am having a very hard time understanding the questions and how to do them. I have to solve the linear system by using elimination. The problem is<BR>\n" );
document.write( "3x=y-20<BR>\n" );
document.write( "-7x-y=40\r<BR>\n" );
document.write( "\n" );
document.write( "how do I do this kind of problem? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #200278 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=200278\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> solve the linear system by using elimination. The problem is<BR>\n" );
document.write( "3x=y-20<BR>\n" );
document.write( "-7x-y=40 <BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Rearrange the equations:<BR>\n" );
document.write( "3x - y = -20<BR>\n" );
document.write( "-7x -y =  40<BR>\n" );
document.write( "------------------------<BR>\n" );
document.write( "Subtract the 2nd equation from the 1st and solve for \"x\":<BR>\n" );
document.write( "4x = -60<BR>\n" );
document.write( "x = -15<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Substitute into 3x-y = -20 and solve for \"y\":<BR>\n" );
document.write( "3(-15) - y = -20<BR>\n" );
document.write( "-45 -y = -20<BR>\n" );
document.write( "y = -45+20<BR>\n" );
document.write( "y = -25<BR>\n" );
document.write( "=======================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );