Question 879083
a.
L = 2W - 9
More information is needed to solve this problem.  The length has an infinite number of possibilities.
.
b.
L = 2W - 16
Same thing.  You need more information.  Maybe the width here is 10' and the length would then be 4'.  Or the width is 20' and the length is 24'.  Or the width is 30' and the length is 74'. Etc.  Something is missing.