Respuesta :

To find if a relation is a function, identify if there is more that one value of y for the same value of x (if there are more than one value for one value of x is not a function)

Ordered pairs (x,y)

1.

x y

1 -2

-2 0

-1 2

1 3

As there are two values of y when x=1. (1 , -2) and (1 ,3). The relation is not a function

2.

x y

1 1

2 2

3 5

4 10

5 15

As there are no more than one value of y for the same value of x. The relation is a function.