Is just equal to 8.

So this is equal to y plus I'm just adding this whole term to both sides of this equation plus a squared over s squared y is equal to so this term is now gone, so it's equal to this stuff.

four y x. two times two times y times x.

If this were true, then we could rewrite this as the partial of psi, with respect to x, plus the partial of psi, with respect to y, times dy, dx, equal to 0.

Plus 20 divided by 5 is 4. x squared divided by x is x. y squared divided by y is y.

If x is equal to the square root of y, then x squared is just y.

And actually, I'm going to do that right now.

We have supervised learning, in which the training set is a bunch of input output pairs

So 2 times minus 3 e to the minus 3x plus oh sorry, minus 3 times y.

16 plus 9.

And then we get psi is equal to x squared plus 3x, plus some function of y.

little bit.

The width is 4y, and the height here is 2y.

And then we can distribute this 3.

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I'll rewrite it down here.

Plus the derivative of this with respect to why is 3 times we're just doing the chain rule the derivative of y with respect to x.

Let's add 16 to both sides.

So we're really curious

Can you tell me what is b r?

So The partial of psi with respect to y, this is 0, this is minus x squared.

Well, let's say that I said that y prime plus y is equal to x plus 3.

The only difference between that and that is they put y's here.

However, there's only 1 variable here, x. So y never changes.

And then y times y, well that's just y squared,

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