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Pearson Algebra 1 Common Core, 2011 View details

1. Inequalities and Their Graphs

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Exercise 28 Page 168

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

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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. 5.75>d Observing the given inequality, we see that 5.75 is greater than all values of d. This means that the solution set lies to the left of 5.75 on a number line. Furthermore, the inequality symbol indicates that d=5.75 is not a solution, which we will mark with an open circle on the number line at 5.75.