for

- A is the amplitude of the graph. This will determine the values on the y axis the graph will reach.
- B is the 'compression' of the graph. If the graph will be squashed together on the x-axis by a factor of B. If then it will be spread out by a factor of B
- C is the shift on the x-axis. If the shift will be towards the left (ie more negative) by C units. If the shift will be towards the right by C units

edit:

The first graph shows the effects of various transformations

The second graph shows the graphs you need to draw with sin(x) for comparative purposes