Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
1. Writing and Graphing Inequalities
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Exercise 32 Page 59

For inequalities on a number line, what does it mean when a point is open or closed?

Practice makes perfect
To graph an inequality on a number line, we need to make note of two things: the direction of the inequality and whether it is strict.

-2 < w Observing the given inequality, we see that -2 is less than all values of w. This means that the solution set lies to the right of -2 on a number line. Furthermore, the inequality symbol indicates that w=-2 is not a solution, which we will mark with an open circle on the number line at -2.