Determine if the relation is a function or your answer.

plz !

1) { (3,6), (3,5), (6,5), (7,5) }

2) { (6,7), (8,9), (2,7), (5,10) }

3) { (3,6), (5,9), (4,10), (2,8), (3,9) }

4) { (1,5), (1,8), (1,13), (1,6) }

In a function, every value of x must have a unique value of y. But every y value is NOT required to have a unique x value.

Only #2 is a function.
2) { (6,7), (8,9), (2,7), (5,10) }  ---> y values are repeated but not x values


1) { (3,6), (3,5), (6,5), (7,5) } 
---> When x== 3, there are two y values

3) { (3,6), (5,9), (4,10), (2,8), (3,9) }
---> When x== 3, there are two y values

4) { (1,5), (1,8), (1,13), (1,6) }
---> When x== 1, there are 4 y values