What are the Domain and Range of this graph in set notation?

Answer:
Ok:
Step-by-step explanation:
Domain: {x| x ϵ ℝ}
Range: {y| y ≤ 3}
ϵ - means 'belongs to the set of'
and ℝ means 'all real numbers'
What it mens is that x is defined at every x value.