Question

Let A = {a, b, c} and B = {5, 7, 9}. State, which of the given are relations from B to A.

{ (a, 5), (a, 7), (b, 7), (c, 9) }

Answer 1

For a set of ordered pairs to be a relation from B to A, then the x-coordinates of the ordered pairs should be from B and the y-coordinates should be from A.
Now, in the given set of ordered pairs, the x-coordinates of the ordered pairs are not from set B and the y-coordinates are not from the set A. Hence, the given set of ordered pairs is not a relation from B to A.