Give the Domain and Range of the relation

1. { (2,1), (3, 2), (4, 3), (5, 4) }

2. Find f(-1) for the function f(x) = 4x + 5

The domain is the set of first entries={2,3,4,5}. The range is the set of second entries=(1,2,3,4), where {} denotes a set.

f(-1)=4*(-1)+5=-4+5=1.

These are very basic ideas.