At Computech ( I'm not sure if other schools teach it like this, too ), when we put the inequality on a number line ( Read my inequalities post for more information ) we always put an open dot if it is not equal to, but a closed one if it is. Now, you might think, Why?  This is the reason why: When you have x is greater than or equal to 3, then it means that any number you plug in for , has to equal, or be greater than, 3. But if you're showing that on a number line, then you would put a closed dot, because the inequality is including 3. But if you have an inequality like x>3, then you make an open circle because you are not including 3, as the possible range of answers for the inequality.We would also show an arrow pointing to the way the inequality goes. So x>3 would have an arrow pointing to the right, because it is everything on the number line and further off the number line.

The easiest way to remember this is that you would put a closed dot to include the number, but an open one to exclude it. It's confusing the first few times, but it gets easier to remember later on. I've already mastered and learned it, and I'm sure it won't be that hard for you. Make sure you read my "What I Learned in Algebra Class: Part 1" to get more information and harder problems with inequalities, or check out my whole "What I Learned in Algebra Class" series to help you with any math needs of yours. And make sure you geve me feedback on what you think
 





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    Author: Vahae O.

    These Math Mondays blogs are about various subjects and problems with math. There are also simple math tricks on different things stated.