**What does an open circle on a graph point mean?**
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-equations-and-inequalities/cc-6th-inequalities/v/plotting-inequalities-on-a-number-line

An open circle means the function is not defined at that point. When graphing the interval 0 ≤ x < 1, you would put a filled-in circle at x=0 and an open circle at x=1, indicating x=1 is not part of the graph, but points very close to x=1 are part of the graph. Open circles are used for the same purpose on other kinds of graphs, too. Rate!

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