When the inequality sign is < / > (less than/greater than), you use an open circle.
When the inequality sign is ≤ / ≥ (less than or equal to/greater than or equal to), you use a closed circle.
"The endpoint of a line graph starts with a closed circle on 1 and continues with an arrow in the positive direction."
(x represents the unknown number)
x ≥ 1 [x is any number greater than or equal to 1]
The reason why the inequality is x ≥ 1 is because there is a closed circle on 1 which means x can = 1, and the arrow is in the positive direction which means that the numbers are increasing and are greater than 1