# "Linear Models and Functions" Please respond to the following:

**Question description**

- Describe applications of the Cartesian coordinate system to plot a real-world situation. In your description, indicate the characteristics of each coordinate, and a point in terms of specific x and y coordinates.
- Explain what the author means by “fickle picker” to help determine if a set of ordered pairs represents a function and how it can be used to identify a function. Provide an example.
- Explain whether it matters or does not matter which values you pick for x when you graph a line by plotting points. Explain your reasoning.

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