The length of a rectangular field is 5 meter less than 4 times its width. The perimeter is 90 meters. Calculate the length and width of the field.
please help
P=2L+2W
90=2(4w-5)+2w
90=8w-10+2w
90+10=10w
100/10 == 10w/10
10=w
90=2(4w-5)+2w
90=8w-10+2w
90+10=10w
100/10 == 10w/10
10=w