Question

Need some help solving three equations three unknowns.

Answer 1

Given:
\[2F_B=F_A\]
Solve:
\[F_B∗cos(θ)−F_A∗cos(30)=0\]
\[F_B∗sin(θ)+F_A∗sin(30)−98.1=0\]

Answer 2

Where do you run into issues? Try plugging the first equation into the second, solving for F_A or theta, and then plugging that value into the 3rd equation and solving for the remaining variable.