Answer and explanation:
The supply theory studies the relationship between the quantity supplied of a good or service and its price. If the quantity supplied decreases so will the price. If the quantity supplied increases so will the price. The relationship between the quantity supplied and the price is directly proportional.
To draw the supply curve, a coordinate graph is used. Typically the price takes the vertical "Y" axis while the quantity supplied takes "X" horizontal axis. The fluctuations in price and quantity supplied will be joint in different points along the chart.