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the perimiter of a rectangle is 84 cm. The lenght is 6 less than twice the width. find the length and width of the rectangle. i also need an equation or inequality.

Guest Apr 2, 2017
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 #1
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The perimeter  is given by 2W + 2L     where W and L are the width and length

 

And we are told that  L = 2W - 6  .... so we have

 

84   = 2W + 2 ( 2W - 6)   simplify  

 

84 =  2w + 4W - 12

 

84 = 6W - 12    add 12 to both sides

 

96  = 6W    divide both sides by 4

 

96 / 6 = Width   =  16 cm

 

And the Length is   2(16) - 6  =   32 - 6   =   26 cm

 

 

cool cool cool  

CPhill  Apr 2, 2017
 #2
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u r the greatest! Thanks!

Guest Apr 2, 2017

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