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Oh, may be you are asking about surfaces.. I thought about equation \(F(x,y)=0\).

surfaces yea

that is the function f(x,y)=x^2-xy+y by the way

ouch... hurts my brain!

I am not sure how to generate those graphs easily by hand... sorry!

|dw:1349108764775:dw|

Well thanks for trying. might just be a nutt to crack and then you can do it everytime.

Yea okay i have it on a sketch infront of me - i think.

Why do you need to draw it?

Can you send a photo of what you've got?