Question 82229
the eqn for the problem is 

let the width be x, the perimeter is give as 48
perimeter=2(l+b)
therefor L=9+2x
48=2((2x+9)+x)
48=4x+18+2x
take 18 over
48-18=6x
30=6x
x=30/6
x=5
therefore the width is 5in.
if you doubt your answer you cn always fix it back to the eqn to test your answer