document.write( "Question 109136: Suppose that the length of a rectangle is 3 inches longer than the width and that the perimeter of the rectangle is 78.Set up an equation involving only L, the length of the rectangle.Solve this equation algebraically to find the length of the rectangle. Find the width as a slope
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Algebra.Com's Answer #79581 by MathLover1(20849)\"\" \"About 
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if the \"length+\"of a rectangle is \"3\" \"inches\"\"+longer\" than the \"width\", then we have\r
\n" ); document.write( "\n" ); document.write( "\"L+=+W+%2B+3in\".....=> \"W=+L+-+3\"\r
\n" ); document.write( "\n" ); document.write( " if the \"perimeter+=+P\" of the rectangle is \"78\", then we have:\r
\n" ); document.write( "\n" ); document.write( "\"P+=+2%28L%2BW%29\"\r
\n" ); document.write( "\n" ); document.write( "\"78+=+2+%28+L+%2B+%28L+-+3%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"78+=+2%282L+-+3%29\"\r
\n" ); document.write( "\n" ); document.write( "\"78+=+4L+-+6\"\r
\n" ); document.write( "\n" ); document.write( "\"4L+=+78+%2B+6\"\r
\n" ); document.write( "\n" ); document.write( "\"4L+=+84\",,,,,,,divide both sides by \"4\"\r
\n" ); document.write( "\n" ); document.write( "\"L+=+21\"\r
\n" ); document.write( "\n" ); document.write( "then:\r
\n" ); document.write( "\n" ); document.write( "\"W+=+21+-+3\"\r
\n" ); document.write( "\n" ); document.write( "\"W+=+18\"\r
\n" ); document.write( "\n" ); document.write( "check:\r
\n" ); document.write( "\n" ); document.write( "\"2%2821+%2B+18%29+=+2%2A+39+=+78\"
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