Answer:
Step-by-step explanation:
It's true. If you have a straight line and you put the endpoint of a ray on that line and let the ray go in the direction it is pointing, 2 angles will be formed unless the ray is part of the line.
The way the question is worded, you have a linear pair which means there are 2 distinct angles whose vertex is on a line.
That's the very definition of supplementary.
