A truss analysis includes consideration of Joint B as shown. If Bx is $8\mathrm{.}9$ kips and By is $7$ kips, find member force $BC$ in kips. Use positive for tension and negative for compression. The horizontal distance from $A$ to $B$ is $16ft,$ the horizontal distance from $B$ to $C$ is $18$ feet, and the vertical distance from $A$ to $B$ and $C$ is $12ft.$