Answer:
First two diagrams
Step-by-step explanation:
In the following diagram, angles a and b are supplementary of they add up to 180 degrees. Since there aren't any angle measurements, we can visually check if two angles are supplementary by checking if they form a straight line. Looking at the different graphs, we see that a and b form a straight line only in the first and second graphs. Therefore, the angles a and b are only supplementary in the first two diagrams.
