Screenshot of part 1 is attached, no screenshots available for part 2.

Part 1 - (a) Find the least squares equation for a simple linear regression model.

Part 1 - (b) Obtain the partial derivatives for beta0hat and beta1hat in a simple linear regression model.

Part 2. How would this translate over to a multiple linear regression equation? e.g. how would I find the least squares for an MLR model and which partial derivatives would I have to obtain and how?

Hope this makes sense, any assistance would be much appreciated :)