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.