Question

Select the relations that are functions.

{(a, 1), (b. 1), (C, 1)]
[(a, a), (a, b). (a. c)}
{(1,-a), (2. a). (3. a)]
f(a, a), (b, b), (C, c)]

Answer 1

{(a, 1), (b, 1), (C, 1)}

{(1, -a), (2, a), (3, a)}

{(a, a), (b, b), (C, c)}

Answer 2

• {(a, 1), (b, 1), (C, 1)}
• {(1, -a), (2, a), (3, a)}
• {(a, a), (b, b), (C, c)}

Explanation:

Any relation with distinct inputs is a function. If inputs are repeated, the relation is not a function.