Final answer:
The length of each wall in the square chicken coop, with a total fencing of 20 yards, is 5 yards. The correct equation to use is 4x = 20, and solving for x gives us the result x = 5 yards.
Step-by-step explanation:
The question asks for the length of each wall of a square chicken coop if the total amount of fencing used is 20 yards. In a square, all four sides are equal in length. Therefore, to find the length of one side (x), we can use the equation 4x = 20 where x is the length of one side of the square.
To solve for x, we divide both sides of the equation by 4:
x = 20/4, which simplifies to x = 5. Hence, the length of each wall of the square chicken coop is 5 yards.
The correct equation and solution that represent 'x', the length of each wall of the square coop is: 4x = 20, x = 5.