The area of a rectangle is X & # 178; + xy-12y & # 178;, and its length is x + 4Y

The area of a rectangle is X & # 178; + xy-12y & # 178;, and its length is x + 4Y

Width: (X & # 178; + xy-12y & # 178;) / (x + 4Y)
=(x-3y)(x+4y)÷(x+4y)
=x-3y
Perimeter: (x-3y + X + 4Y) × 2 = 2 (2x + y) = 4x + 2Y