document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1171574>Question 1171574</A>: <I><SPAN STYLE=\"word-break: break-all;\"> x=3y,x-3y=0 using substitution  </SPAN>\n" );
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document.write( "The 1st equation is x = 3y<BR>\n" );
document.write( "It means x is the same as 3y. <BR>\n" );
document.write( "Whenever we see \"x\", we can replace it with \"3y\".\r<BR>\n" );
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document.write( "We'll do so in the 2nd equation.<BR>\n" );
document.write( "x-3y = 0<BR>\n" );
document.write( "<font color=red>x</font>-3y = 0<BR>\n" );
document.write( "<font color=red>3y</font>-3y = 0<BR>\n" );
document.write( "0 = 0<BR>\n" );
document.write( "We get the same thing on both sides. <BR>\n" );
document.write( "Therefore, we have <font color= blue>infinitely many solutions</font>\r<BR>\n" );
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document.write( "This is the case because x = 3y can be rearranged to x-3y = 0, and vice versa.<BR>\n" );
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