The interval on a number line (-∞, -6) using set-builder notation is;
{ x | x ∈ R, x ≤ -6 }
<h3>How to express an interval in set builder notation?</h3>
Set-builder notation is a mathematical notation for describing a set by representing its elements or explaining the properties that its members must satisfy.
Real numbers (R) include all rational and irrational numbers. Thus, If we need to write the interval on a number line (-∞, -6) using set-builder notation, we will write as:
{ x | x ∈ R, x ≤ -6 }
In words : "x such that x belongs to R, x is less than or equal to -6"
This shows that x is any real number less than or equal to -6
Read more about set builder notation at; brainly.com/question/24438069
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