Let width be x,
Length: 3+x
P=2(l+w)
54=2(x+(x+3))
54/2=2x+3
27=2x+3
27-3=2x
24=2x
24/2=x
12=x
Therefore, the width is 12 inches and the length is (12+3)=15 inches
Hope I helped :)
The answer is y=0. As you can see in the graph when x=1, y=0. I added a picture so you can see it.
Yes im pretty sure its correct