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Help.

 
NotSoSmart  Oct 10, 2017
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Call the width, W

Then the length, L, is 4W + 9.7 

 

And the perimeter is  2(W + L)  = 

 

2 (W + 4W + 9.7)  = 91.4     simplify

 

2 (5W + 9.7)   =  91.4

 

10W +  19.4  =  91.4    subtract 19.4 from both sides

 

10W  = 72      divide both sides by 10

 

W  = 7.2  cm

 

And L  = 4(7.2) + 9.7  = 38.5  cm

 

 

cool cool cool

 
CPhill  Oct 10, 2017

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