Answer:
a = 6y - 5
Step-by-step explanation:
The sides and the angles of a regular polygon are congruent.
The perimeter of a regular octagon is given by (48y - 40).
Let each side of the regular octagon is a, then its perimeter will be equal to 8a.
Hence, 8a = (48y - 40)
⇒ a = 6y - 5.
So, this is the expression to represent the length of one side of the octagon. (Answer)