Question

3. Which is a function?

A) {(6,3), (5, 2), (4, 1), (3, 0), (4, -1), (5,-2), (6,-3)}

B) {(7,2), (100, 10), (13, -7), (7,9), (10, 100), (4, -2), (5,5)}

C) {(12, 3), (11, 2), (10, 1), (9,0), (8, 1),
(7, 2), (6,3)}

D) {(1000, 10), (1000, 12), (1000, 16), (100, 5), (100, 7), (78, 3), (90, 5)}

Answer 1

C) {(12,3), (11,2), (10,1), (9,0), (8,1), (7,2), (6,3)} Is a function.

Explanation:

The easiest way to tell if a Relation is a Function (in my opinion) is the Verticle Line test. Use your pairs and put them in a graph. Then connect the dots, and if your line at any point touches the graph once, then your Relation is a Function. If it touches the graph more than once, it is not a Function.

Regards!