Answer:
To exclude the values that are not in the domain/range.
Explanation:
When a less than sign is used, it means the value is excluded in the range/domain of the function.
However, when less than or equal to sign is used, it means the value is included in the range/domain of the function.
Take for an example:
[tex]\left\lbrace x<5|x\text{ is a whole number}\right\rbrace [/tex]The values of x will start taking values from 4.
However in the case:
[tex]\left\lbrace x\leqslant5|x\text{ is a whole number}\right\rbrace [/tex]The values of x will start taking values from 5.
