document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=130090>Question 130090</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780395977224/algebrahomeworkh>algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> This is a last Subsitution question, but this one says solve by either ;addition or subtraction.\r<BR>\n" );
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document.write( "The problem is:<BR>\n" );
document.write( "12a-5b=18<BR>\n" );
document.write( "15a-5b=30\r<BR>\n" );
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document.write( "Please and Thank You=) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #95000 by </B><A HREF=/tutors/aboutme.mpl?userid=oscargut><B>oscargut(2103)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oscargut><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=oscargut><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=95000\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 12a-5b=18<BR>\n" );
document.write( "15a-5b=30 <BR>\n" );
document.write( "then<BR>\n" );
document.write( "12a-5b=18<BR>\n" );
document.write( "-15a+5b=-30\r<BR>\n" );
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document.write( "adding\r<BR>\n" );
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document.write( "-3a=-12<BR>\n" );
document.write( "then<BR>\n" );
document.write( "a=4\r<BR>\n" );
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document.write( "then\r<BR>\n" );
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document.write( "12(4)-5b=18<BR>\n" );
document.write( "then<BR>\n" );
document.write( "30-5b=0<BR>\n" );
document.write( "then<BR>\n" );
document.write( "b=6\r<BR>\n" );
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document.write( "R: a=4 and b=6\r<BR>\n" );
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document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );