To graph all the values less (but not equal) to nine (9) using the number line, we can use parentheses, which mean that the value is not equal to the number, or we can use an arrow with a circle above the number. We can see this as follows:
Or
In both cases, we can see that we are representing all the numbers less than 9 but not equal to 9. The arrow is pointed to the left (representing the numbers less than 9).
In interval notation, we can represent it as follows:
