***** NOT A TEACHER*****
(1) A teacher will be with you shortly (soon).
(2) May I just most respectfully and gently make a few points:
(a) If you are writing a "formal" passage, then I should suggest that "for example" would be more appropriate than "let's say."
(b) And "He/she" is rather awkward (and quite ugly-looking, IMHO) in a formal statement. You might consider another way of expressing this. For example,
you could change "a person" to "people." Then you could use "they" in later references.
HAVE A NICE DAY!
Student or Learner