The width of the rectangle can be represented as x, and the length can be 5x. Therefore, the area of the rectangle is x(5x)=84.
Solve for x:
6x=84
*Divide both sides by 6*
x=14
So, the width of the rectangle is 14. To find the length, multiply 14 by 5. The length is 70.
To find the perimeter, add up the length of each side:
14+14+70+70=168
The perimeter of the rectangle is 168.