Question 72861
The area formula for a rectangle is Area = length x width
So since the Area = 2xy, and the width is y. That means the length is 2x. 

Perimeter of a rectangle = 2(l + w) or 2l + 2w. 

So if width = y and the length = 2x. Then fill in the formula.

Perimeter = 2(2x + y) or 2(2x) + 2y which equals 4x + 2y