The figure shows a square divided into a square of side x units and four congruent rectangles. What is the perimeter, in units, of one of the four congruent rectangles? Express your answer in terms of x and y.
+2666 Each rectangle has 2 short sides and 2 long sides.
The long sides are just y, and the short sides are \(y - x\).
This means we have: \(y + y - x = \color{brown}\boxed{2y - x}\)
