nonempty set and the collection of all the second coordinates forms another nonempty set.
Activity 1:
Suppose you are given the following relations.
Set S= {(a, 1), (a, 2), (a, 3), (a, 4)
Set T= {(x, y) ly=x+
1 where r is an integer between 0 and 5}

1. What is the set of all the first coordinates in each relation?
Set S =______________
Set T = _____________
2. What is the set of all the second coordinates in each relation?
Set S= _______________
Set T= _______________​