Hi,

     .

L + w = 55

(3w+7) + w = 55ft

4w = 48

w = 12ft and L = 43ft 

and checking...

sum = 55ft 

Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!
 



the length  of a rectangle is seven more than three times the width 







 and the perimeter is 



since , we have



 



 



 ...substitute 



 ....solve for 



















now find 



















 

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