Asquare garden has a side of length that is 3 meters shorter than the length of a rectangle garden. find the perimeter of the rectangle garden in terms of y. square perimeter is 8y. rectangular side is 2y+1

If the square perimeter is 8y, then the square side would be:
square perimeter= 4*side
8y= 4*side
side=2y

The square garden side is 3m shorter than the length of the rectangle garden. The rectangle garden length will be:
rectangle length= square sides +3
rectangle length= 2y+3

rectangle perimeter= 2(rectangle length + rectangle side)
rectangle perimeter= 2(2y+3 + 2y+1)
rectangle perimeter= 2(4y+4)
rectangle perimeter= 8y + 8