I'm supposed to find the dimensions of a rectangular region with a maximum area that can be enclosed by 80 feet of fencing. this is what I have so far...

2x+ 2y=80

-2x -2x

2y=80-2x

y= 80-2x

------ --------> y= 40- (-1x)

2

Can somebody telling me if this is right so far?I got the -1x from the -2x

---

2

Is that correct so far? If not, could you please set me on the right track?