Answer:
Patricia is bound to perform.
Step-by-step explanation:
Patricia and Albert have a principal-agent relationship. Albert has express authority regarding the sale of the car, and that means that Patricia (the principal) is bound to perform the agreement made by Albert on her behalf. It doesn't matter if Patricia was an undisclosed principal, her duties and obligations are the same.
If she fails to perform, Zeke can sue in order to either recover damages or seek specific performance.