Because if there are two inequality eqations, you can find out which overlap if graphed.
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Not greatly. To graph an inequality, you start off graphing the corresponding equality. It is only then that you select one side or the other (with or without the graph itself), as the region of interest.
With the equal sign (=).
strict inequality
Hi
because writing out all the solutions is not necessarliy a correct answer but a number line is and because graphing out also helps you get a mental image of the concept.