Calculate the$$vertical reaction at support A$$when the horizontal force,$$X $=8$kN$$and$$the vertical force,$$Y $=19$kN$$are applied to the truss. $($Note: Assume that forces pointing to the right are positive$)$

Calculate the$$vertical reaction at support B$$when the horizontal force,$$X $=6$kN$$and$$the vertical force,$$Y $=13$kN$$are applied to the truss. $($Note: Assume that forces pointing to the right are positive$)$

Calculate by hand the forces in member AB using the Resolution at Joints method$$when the horizontal force,$$X $=6$kN$$and$$the vertical force,$$Y $=18$kN$$are applied to the truss. $($Note assume tension forces are positive$)$