They are adjacent because they share a corner and vertex
You can tell this because they are right next to each other
They are supplementary because when added together, they make a 180° angle
You can tell this because when looking at the two, you can see they make up a straight line (that’s just slanted a bit, that doesn’t matter)
They are also a linear pair because when two lines intersect each other at a point
You can tell this because they are adjacent and make up 180°