Answer:
6W + W = 770
==> 7W = 770
W = 110 and L = 660 in case you are looking for the solution
Explanation:
Let L -= length and W the width of the rectangular field
six times as long as it is wide translates to:
L = 6W
Perimeter of field = 2(L + W)
Given perimeter = 770 feet
2(L + W) = 770
L + W = 770/2 = 385
Since L = 6W, substitute for L in the above equation:
6W + W = 770
7W = 770
W = 770/7 = 110 feet
L = 6W = 6(110) = 660 feet