SOLUTION: if real number a < b then sketch the R\ (a,b] on the real number line

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Question 1091060: if real number a < b then sketch the R\ (a,b] on the real number line
Answer by ikleyn(52903) About Me  (Show Source):
You can put this solution on YOUR website!
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They want you depict the number line with the semi-interval (a,b] cut off:


==============(------------]===============(number line)==============

              a            b


The entire ray  (-infinity,a] belongs to R \ (a,b], including the point x = a.


The set  x > b also belongs to R \ (a,b], but the point x= b does not belong to this set. It is excluded from the set.