The solution set for the number line of inequality can be represented as,
{x | x ≤ 4. 5}
The number line is the way of representation of number and digits in a arranged form to understand the data batter.
The meaning of circle in number line,
The number line going from negative 5 to positive 5 and a solid circle appears between positive 4 and positive 5. The middle point of 4 and 5 is 4.5.
The solid or closed circle means that the value has less than or equal to 4.5. Thus, the solution set for the number line of inequality can be represented as,
{x | x ≤ 4. 5}
Learn more about the number line here;
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