What are connected rates of change?

• In situations involving more than two variables you can use the?chain rule?to connect multiple rates of change into a single equation

• Equations involving derivatives (ie rates of changes) are known as?differential equations
  • These can be solved using methods of integration (see Differential Equations )
  • However setting up the equation from the information given can involve the chain rule and connected rates of change

• Note from the examples above that you will often need to differentiate a formula to get one of the rates of change you need