Algebra: A Combined Approach (4th Edition)

Let $w$ be the width. Let $l$ be the length. $l=3w-2$ $2l+2w=28$ $2(3w-2)+2w=28$ $6w-4+2w=28$ $8w-4=28$ $8w=32$ $w=4$ $l=3w-2$ $l=3(4)-2$ $l=10$