Posted by MATH DUDE on Monday, January 3, 2011 at 10:06pm.
It should be an open dot because it's an inequality. It would be a closed dot if it was an equality, such as x=3.
If the inequality contains either ≤ or ≥, then close the dot of the endpoint, since that point is included in the graph.
If the inequality contains eitehr < or > , then leave the dot open to show that the endpoint itself is not included in your graph.
yes! if it is addition or subtraction you have an open dot! if it multiplication or division than a closed dot!
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