Chapter 3 - Solving Inequalities - 3-6 Compound Inequalities - Practice and Problem-Solving Exercises - Page 205: 36

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Two lines on the same graph represent a compound inequality that includes "or". An open circles at the left endpoint means -2 is not part of the solution set, so the inequality operator does not include "or equal to". A solid circles at the right endpoint means 1 is part of the solution set, so the inequality operator includes "or equal to".