**Evaluating Functions | Purplemath**
https://www.purplemath.com/modules/evaluate2.htm

By the way, evaluating the same equation at three or more points like this, and getting a list of points, is how you plot points and graph equations.. In the case of the equation y = 4x – 3, the points from the evaluating we've done (including the point from the previous page) are: (–1, –7), (0, –3), and (3,–9).. Plotting these points and putting a straight line through them, we get ...

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