Thread: Plot two risky assets

So i have to plot the feasible set for two risky assets on excel as my first question, where the user inputs everything but the weights.

So I have done weights 0-1 in steps of 0.05

I thought I had done it correct but then my next question is:

Plot the set of all portfolios in the feasible set that do not require negative
weights, i.e. for which w1,w2>= 0.

I'm very confused as I thought I did this in question 1. What have i done wrong?

My graph for question 1 looks like a curve in the shape of a c.

since no one else has replied, i will guess:

If borrowing is allowed the a negative allocation of one asset is possible, the only constraint is w1+w2=1