Your answer is clear and mostly grammatically correct. Here are a few minor errors and suggestions for improvement:
- "what to sound like" - This phrase is slightly awkward. You could instead say "how to convey their emotions" for clarity.
- "as if it was actually happening" - The phrase "as if it was" should be changed to "as if it were" to correctly use the subjunctive mood.
Revised version: "The stage directions would impact the way that actors perform this scene by giving the actors directions on how to convey their emotions. This helps make the performance seem as if it were actually happening."