1. Differential equations

2. Many applications of mathematics involve two variables and a relation between them is required. This relation is often expressed in terms of the rate of change of one variable with respect to another. This leads to a differential equation. Its solution is an equation connecting the two variables.

3. Types of differential equation We will be solving differential equations of the form:

4. Type 1: example

5. Type 1: word problems Do Q1-Q8, pp.277-278

6. Type 2 differential equations Do Q1-Q7, pp.284-285

7. Type 3 differential equation Do Q1-Q12, pp.289-290Do Q1-Q23, pp.290-295