1. Writing and Graphing Inequalities
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For inequalities on a number line, what does it mean when a point is open or closed?
z ≤ 5 Observing the given inequality, we see that all values of z are less than or equal to 5. This means that the solution set lies to the left of 5 on a number line. Furthermore, the inequality symbol indicates that z=5 is a solution, which we will mark with a closed circle on the number line at 5.