Question 404939
Let length equal "w+34" and width equal "w". 
You know that the total perimeter is 268 feet and that you need to add all sides together to get the perimeter. Thus:
(w+34)+(w+34)+w+w=268 feet
4w+68=268
4w=200
w=50
Now plug it back in. 
w=50
w+34=84
And there's your answer.
width=50
length=84
You can also plug it back in to make sure it's right. 
84+84+50+50=268
168+100=268
268=268 √