Question 956409
W=width; L=length=6W; P=perimeter=84yds; A=area
P=2(L+W) Substitute for L.
84yds=2(6W+W) 
84yd=12W+2W
84yd=14W Divide each side by 14.
6yd=W  The width of the rectangle is 6 yards.
L=6W=6(6yd)=36 yards The length is 36 yards.
A=L*W
A=36yd*6yd=216 sq yd ANSWER: The area is 216 square yards.