The law of supply states that, all else being equal, an increase in price results in an increase in quantity supplied, and a decrease in price results in a decrease in quantity supplied.
Based on this, the two correct answers that satisfy the law of supply are:
- An increase in price is followed by an increase in quantity supplied.
- A decrease in price is followed by a decrease in quantity supplied.
(Note: The other statements that mention changes in supply rather than quantity supplied do not correctly represent the law of supply.)