Two-Bond Hedge

I simply cannot get this down, and I have gone over it several times. Just one of those things. Anyone?

Is the problem solving simultaneous equations? If so try youtube

needn’t consider it , if you know 2 and 10 year bond to control level and twist it is enough it is time consuming

The calculation is very involved. As long as you understand the theory, chances are that is enough.

If it shows up in the afternoon, you can brute force it if you know how to setup the 2 equations.