Question 887561
width: x
length:3x-9
perimeter: width +width +length+ length=89
or ------ 2width+2length=89

2x+2(3x-9)=89
2x+6x-18=89
8x=107
x=13.375

width :13.375 ft
length:
3(13.375)-9
31.125 ft

ANSWER length:31.125ft
width 13.375 ft