Determine if the given relation is function or not. Give its domain and range.
16. (-1, 2), (1, 3), (-1, 4), (2, 5)
17. (1, 1), (2, 2), (3, 3), (4, 4)
domain is set of all 1st numbers
range is the set of all 2nd numbers
function iff each 1st number maps to a unique 2nd number.
So, what do you get?