SOLUTION: x is less than or equal to 1 or x is greater than or equal to 7. How do I determine if the numbers listed on the numberline are marked by a solid dot or a clear circle?
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Question 340407: x is less than or equal to 1 or x is greater than or equal to 7. How do I determine if the numbers listed on the numberline are marked by a solid dot or a clear circle?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Same idea as your question about the brackets and parentheses in interval notation. If the endpoint is included as when you are dealing with 
or 
, then you use a solid dot. If the endpoint is NOT included, as when you are dealing with 
or 
, then you use an open circle.
Summary:
If in Set Builder Notation or an Inequality you see or , then in Interval Notation you use [ or ] and in graphing on the number line you use solid dots.
If in Set Builder Notation or an Inequality you see or , then in Interval Notation you use ( or ) and in graphing on the number line you use open dots.
John
My calculator said it, I believe it, that settles it
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