Answer:
Step-by-step explanation:
Perimeter is equal to twice the length plus twice the width
       Perimeter = 2L + 2W        factoring out the 2
       Perimeter = 2(L + W)       L = (8x + 5 - 3x)    W = (4x - 1)    
                                                first I would simplify L    collecting the terms of x
                                                 L = (5x + 5)
       plug in to L and W    
       Perimeter = 2 (( 5x + 5 ) + ( 4x - 1 ))            L = (8x + 5 - 3x)    W = (4x - 1)
       Perimeter = 2 (  5x + 4x + 5 -1 )                 collect like terms
       Perimeter = 2 (  9x +4)                                    2 times the 9 and 4
       Perimeter = 18x + 8                            SOLVE for x
       Perimeter - 8 = 18x + 8 -8
       Perimeter - 8 = 18x
       (Perimeter - 8) / 18 = 18x / 18
       (Perimeter - 8) / 18  =  x
 remember the Perimeter equals 88
        (88 - 8) / 18  =  x units                     
              4.444444444  units   =  x       
This seems like an odd number so let's it
     Perimeter = 2 (( 5x + 5 ) + ( 4x - 1 ))
     Perimeter = 2 (( 5(4.444) + 5 ) + ( 4(4.444) - 1 ))   = 87.9952
                   close enough with the rounding off error
                      =