Exercise 1 Page 252

We have been asked to identify the variables represented in the given graph. The horizontal axis x is keeping track of time. The vertical axis y is keeping track of the number of slices of French toast. The points on the graph are representative of the number of pieces of French toast at a given point of time.

The green segment shows where the number of slices of French toast increased by multiple slices all at once, the kitchen staff most likely refilled the serving tray. The red segments show the number of slices dropping by one or more slices, people are eating. The blue segments show periods of time when the number of slices stayed the same.