In this graph, the x-axis is representing time with reference to noon, and the y-axis is representing the temperature in degrees Celsius. It's important to understand these axes as it is how we're able to interpret the data on the graph.
More specifically, values on the x-axis (the horizontal axis) are about how many hours we are before or after noon. If the x-value is positive, that means we are that many hours after noon, and if it is negative, we are that many hours before noon.
Similarly, values on the y-axis (the vertical axis) correspond to the temperature in degrees Celsius. If the y-value is positive, the temperature is above 0 degrees, if it's negative, the temperature is below 0 degrees.
Now, let's discuss what the point (0,0) means in this context.
The point (0,0) is where the x-axis and the y-axis intersect. This point is known as the origin and its coordinates are (0,0).
For the x-coordinate of this point which is '0', we know from the definition of our axes, our x-value represents hours before or after noon. Hence, 0 here would signify the time of 'noon' because it's 0 hours before or after noon.
Similarly, for the y-coordinate which is also '0', it signifies the temperature at this time. Here, the temperature would be 0 degrees Celsius as the y-value is 0.
Therefore, the point (0,0) on the graph in this scenario represents the temperature being 0 degrees Celsius at noon.