Question

Select all of the relations that are functions.
{(a, 1), (b, 1), (c, 1)}
{(a, a), (a, b), (a, c)}
{(1, a), (2, a), (3, a)}
{(a, a), (b, b), (c, c)}

Answer 1

a function can't have 2 equal x variables.. remember which one is the x variable? then which ever one has repeating x variables is NOT a function