Hi$,$ I need help solving this structural mechanics problem using the Stiffness Matrix Method. The question involves a two$-$member framed structure with specific boundary conditions and loading scenarios.

Tasks include:

a$)$ Finding member forces under Loadcase $1($distributed load, w$=25$kN$/$m$)$ only.

b$)$ Finding member forces under Loadcase $2($moment at Joint C$,$ M$=50$kNm$)$ only.

c$)$ Finding member forces under combined Loadcase $1+$ Loadcase $2.$

The structure's details are as follows:

Beam length L$=8$m

Square cross$-$section dimensions, a$=150$mm

Modulus of elasticity, E$=200$GPa

I've attached the full problem statement as an image. Could you provide a step$-$by$-$step explanation for solving this? Thanks!