Angles Formed by Parallel Lines and a Transversal

Consider two parallel lines, line A and line B, which are intersected by a transversal line C. The angle formed between line A and line C measures $40^\circ$. If the angle formed between line B and line C is represented by $x$, what is the value of $x$? Be sure to apply the properties of parallel lines cut by a transversal to determine the correct value of $x$.