document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=459614>Question 459614</A>: <I><SPAN STYLE=\"word-break: break-all;\">  I'm 46 years old and working on refreshing my skills.  How do I solve this using the substitution method?\r<BR>\n" );
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document.write( "12a-5b=18  ...(1)<BR>\n" );
document.write( "15a-5b=30  ... (2)\r<BR>\n" );
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document.write( "from eq(2)<BR>\n" );
document.write( "b=3a-6<BR>\n" );
document.write( "substituting the value of b in eq(1)<BR>\n" );
document.write( "12a-5(3a-6)=18<BR>\n" );
document.write( "12a-15a+30=18<BR>\n" );
document.write( "-3a=-12<BR>\n" );
document.write( "a=4<BR>\n" );
document.write( "hence b=3a-6=6\r<BR>\n" );
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document.write( "Thanks\r<BR>\n" );
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document.write( " </SPAN>\n" );
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