Determine the reactions at supports. Using;

$($A is fixed and B is roller support. All elements are axially rigid.$)$

a$)$ Force method $($Use virtual work principle$)$

$($Hint: While taking integral during application of virtual work principle be sure that each moment has contribution on defined displacement$)$

b$)$ Displacement method $($Use slope deflection equations$)$

$($Hint: Determine the directions of FEM carefully, especially for BC element.$)$

$($Hint: FBD of joint B and member BC will be helpful while determining moments.$)$