Answer:
I found:
length = 10cm
width = 7cm
Step-by-step explanation:
Call the length  l , the width  w  and the perimeter  P ; you get:
l  =  2 w  −  4
P  =  2 l  +  2 w
Where  P  =  34 c m
so, substitute the first into the second for  l :
34  =  2 ( 2 w  −  4 )  +  2 w
34  =  4 w  −  8  +  2 w
6 w  =  42
w  =  42 /6  =  7 c m
use this into the first equation:
l  =  2  ⋅  7  −  4  =  14  −  4  =  10 c m
Hope this helps!
