Answer:
There are many differences between substitute goods and complementary goods.Like as:
Substitute goods: When a goods or service replace the other one or used as the alternative then it is a substitute goods.
Complementary goods: When a goods or service complements the other one they are complementary goods. It means during the consume of one goods or service,consumer needs it's complementary goods.
Ice cream: Smoothie is a substitute and pastry is a complementary goods.
Baseball game tickets: Work is a substitute and popcorn and drink is a complementary goods.
Pencil: pen is a substitute and notebook is a complementary goods
Explanation: