document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=253809>Question 253809</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you solve:\r<BR>\n" );
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document.write( "c-5d=2     2c+d=4 </SPAN>\n" );
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document.write( "c-5d=2     <BR>\n" );
document.write( "2c+d=4<BR>\n" );
document.write( "double the first<BR>\n" );
document.write( "2c-10d=4<BR>\n" );
document.write( "2c+d=4<BR>\n" );
document.write( "As you can see we have 2c in the first and 2c in the second<BR>\n" );
document.write( "and after subtracting 10d we get 4<BR>\n" );
document.write( "but we also get 4 after adding d<BR>\n" );
document.write( "which means that d must equal -10d<BR>\n" );
document.write( "d=-10d<BR>\n" );
document.write( "which would lead to d being 0 or 1=-10\r<BR>\n" );
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document.write( "so d=0<BR>\n" );
document.write( "therefore c=2 </SPAN>\n" );
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