ts a simple question i think?.. But im not too sure what the answer is myself, which is obviously why im asking...

Ok, the question goes like this

Maximise and Minimise

subject to

.

I understand that i have to differentiate them in respect to x, y, and then lambda.. Rearrange them accordingly to find x and y.

Edit: ..... (1) Edit: .... (2) Edit: .... (3)
Thats what i get.. Not sure where to go from there, i realise that i have to substitute bits in.. but ive tried everything, and cant really seem to get any further. thanks in advance