linear programming

[Martoman]

I seem to be doing it wrong. Im letting x = Reddie, y = black hawk

Army requires to airlift 450 peeps and 36 tonnes of baggage.
-There are 9 reddies and 6 black hawks avaliable. -> ,
-Each reddie airlfits 45 passengers and 3 tonne of baggage, whilst a black hawk does 30 peeps and 4 tonne. -> and
- Running costs are 1800 for a reddie and 1600 for a black hawk.

I want to know if my equations have been set up right. According to book I should get a point (8,3) on a corner point, which i evidently don't. 

[Gloamglozer]

I haven't checked my answer but I got:

[Martoman]

Oh. So it should be that they need to airlift at least 450 and not at most 450. It should be allowed either way?

[Gloamglozer]

Oh. So it should be that they need to airlift at least 450 and not at most 450. It should be allowed either way?

I thought that because they are required to lift 450 peeps that they couldn't lift 449 peeps and leave it at that, same with the luggage.  But it doesn't say if they can carry more.

What's the answer btw?

[Martoman]

once i use your constraints, it works.