Final answer:
An increase in demand with an unchanged supply curve leads to a rightward shift in the demand curve, resulting in a new, higher equilibrium price and quantity.
Step-by-step explanation:
An increase in demand combined with no change in supply would result in a rightward shift of the demand curve, not just a movement along the existing demand curve. If we see an increase in demand because of factors such as an increase in consumer preferences, income, population, or a change in expectations, the entire curve shifts to the right. Since the supply curve remains unchanged, the equilibrium price and quantity would adjust according to the new demand curve, typically resulting in a higher equilibrium price and greater equilibrium quantity.