power + attitude = performance
i dont know if your school has nailed this into you...but in aus this saying is really pushed.
because if you set a constant power but make a change to attitude (shown by a diagram) willl give you a performance change. (i.e flight path > turn, climb etc and also efffect our insturment...ias etc etc)
from this you can show striaght and level flight (at various airspeed)
you can then intro climbing and descending. i.e if you only changed attitude you would start a climbing flight path, but your speed would drop of too much... (i.e) why we apply full power (i dont think it is worth going into thrust and power curves right yet)
so i would stick to that p+a=performance and show how if u change one variable you change performance!