a book cover has the length and width (in inches). top 31-b, bottom 2+a+2b,sides 3a - b and 2+a+2b,find the values of a and b? Find the perimeter of the book cover.

Answer 1

you know that on a rectangle, the top and bottom are equal, and that the two sides are equal, right? So that gives you

31-b = 2+a+2b
3a-b = 2+a+2b

Make sure you have no typos, and then solve the system of equations.