Lady Macbeth tricks Macbeth into killing Duncan by using her cunning and tricky words. She makes Macbeth think that he has to kill Duncan for his own benefit. Lady Macbeth deceives him into thinking that only he would gain more power, and it wouldn't benefit her. Lady Macbeth counters Macbeth's arguments by saying that he needs to muster up all of his courage, and just follow here directions. Lady Macbeth plans the whole thing out, and influences Macbeth to go along with her plan.
At this point, Lady Macbeth decides to become a motivating factor in helping Macbeth gain the throne. She sets up a well planned plan and presents it to Macbeth. He, however, finds Duncan a good man and a good king, also a good friend of his so he wavers in his decision to carry out the murder. Lady Macbeth