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Beginning Pre-Calculus for Game Developers by Boris Meltreger, John P. Flynt

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Inequalities

Figure 5.5 illustrates the four types of relations that describe inequalities. The relationships that characterize inequalities can unfold in inclusive and exclusive (or non-inclusive) ways. When you use a number line, representing inclusion or exclusion involves two basic activities:

  • A range of numbers can be greater than a given value on a number line. To show that the range of numbers is greater than a given number, you employ an open circle. The circle excludes the circled number from the range.

  • A range of numbers can be greater than or equal to a given value on a number line. To show that the number is included in the range, you use a filled circle.

    Figure 5.5. Open circles exclude values while closed circles include them.

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