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**1. Homework Statement**

a rectangular lot adjacent to a highway is to be enclosed by a fence. If fencing cost $6 per metre along the highway and $4 per metre on the other three sides, find the largest area that can be fenced off for $800.

I get these questions generally, because they're usually area problems, but when they tossed in cost, and that it's the same on 3 walls yet different on the fourth it's just throwing me off.

**2. Homework Equations**

I get that you have two equations in this case something like

xy = Area

x + 3y = 800

(I don't think they're the right ones, just it's supposed to be something like that, if they are right though let me know)

**3. The Attempt at a Solution**

I haven't tried it cause i don't know how to start it