What does the line and load mean in this question?
The &quot;line&quot; represents the cables connecting the source to the load. It consists of the two horizontal sections between the red circles.
The resistance and inductance is all represented on the upper line. I would expect that this is to simplify calculations and that in a real-world transmission line the impedance would be split across both.
The load is the section to the right of the red circles, 15 Ω and -j10 Ω.