document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=362138>Question 362138</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The first side of a triangle is 9m shorter than the second side. the third side is 3 times as long as the first side.the perimeter is 39m. find the length of the longest side. </SPAN>\n" );
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document.write( "let's say the first side is a,the second side is b and the third is c.\r<BR>\n" );
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document.write( "a = b-9 (1)  and 3a = c (2) and perimeter a + b + c = 39 (3) \r<BR>\n" );
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document.write( "put \"a\" in 1st equation to 2nd equation >>> 3*(b-9) = c >> 3b - 27 = c   (4)\r<BR>\n" );
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document.write( "put \"a\" in 1st equation to 3rd equations also >> b-9+b+c = 39 >> c = 39-2b+9  (5)\r<BR>\n" );
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document.write( "put \"c\" in 5th equation to 4th equation >> 3b-27 = 48-2b >> 5b = 75 >> b = 15\r<BR>\n" );
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document.write( "Solve 1st equation >> a = 15-9 >> a = 6\r<BR>\n" );
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document.write( "Solve 3th equation >> 6 + 15 + c = 39 >> c = 18.\r<BR>\n" );
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document.write( "Therefore longest side is c, c=18.\r<BR>\n" );
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document.write( "RF. </SPAN>\n" );
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