Question

ANSWER RIGHT AWAY!!!!​

Answer 1

Function : 1 , 3

Not a Function : 2 , 4

Explanation:

Using the vertical line test for the first two, and the last two you are able to tell because each input (x) can only have one output (y).

Answer 2

1st and 3rd are functions, 2nd and 4th are not functions

Explanation: