Question 322853
Let x = width
3x+7= length


2(    ) + 2(     )= Perimeter
2(x) +2(3x+7)=78
2x+6x+14=78
8x=78-14
8x=64
x=64/8=8 feet = width


3x+7= length
3(8)+7 = length
24+7=31 feet 


Check:  2*8+2*31
16+ 62 =78  so it checks!!


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