Explanation:
if there is an intersection point (the lines are not parallel), there is still the question, if the points on the line are included in the solution or not.
if not, then the intersection point is not part of the solution either.
this is controlled by the absence of presence of the "or equal" part of the inequality.
>= greater than or equal
<= less than or equal
if the inequality is only
> greater than
< less than
the lines are just delimiters, but their points are not part of the solution. and therefore not the intersection point either.