# Temperature Graph with Thermometer Display

- Author:
- Lew W.S.

- Topic:
- Function Graph

The graph shows the water temperature, W in C, in a kettle, at time minutes after heating is started.
For example, 3 minutes after the start, ie. when t = 3, the temperature W=50 C
Use the slider for t to change its values and observe the different corresponding values of W for each t

(a) What is the temperature at t = 1 ?

(b) What is the temperature at the start ?

(c) At what time will the temperature be 74 C

(d) Calculate the gradient of the line (function)

(e) Can you explain what the gradient represents in this situation

(f) Can you write down the function that relates temperature W to time t ?