Question 13186
You should first set up equations that describe the problem.  For the first part of the problem, you will get the equation {{{L = 2W - 7}}}.  For the second part, you get the equation {{{2(L - 1) + 2 (W - 4) = 66}}}.

To solve the problem, first use the distributive property on the second equation.  It changes to {{{2L - 2 + 2W - 8 = 66}}}.  Since you know L = 2W - 7 (from the first equation), you can plug in 2W - 7 for the L in the equaton.  That turns into {{{2(2W - 7) - 2 + 2W - 8 = 66}}}.  You will need to use the distributive property again, which gives you {{{4W - 14 - 2 + 2W - 8 = 66}}}.  Combine like terms, and you get {{{6W - 24 = 66}}}.  To solve, move the 24 over to the right side of the equation, which give you {{{6W = 90}}}, then divide to get W = 15.  To find the length, plug 15 in for W in the first original equation, which gives you {{{L = 2(15) - 7}}}.  Solve for L, and you get 23.