Which relation is a function? a. x -14,-9-1,4,6 y 6,2,-3,2,4 b. x -2,1,9,9,15 y -3,-3,0,-8,12 c. x -4,6,6,7,9 y -1,-3,-1,15,1 d. x -16,-11,10,10,16 y 2,0,1,-9,2

❅☃ To find a function you need to look at the x values, if one of the same x value is repeated more then once, it is considered a non function.
❅☃ Option A:
-14
-9
-1
4
6
As you can see no repeated values.
Therefore A is already our function but lets look at the others just in case. 
❅☃ Option B
-2
1
9
9
15
9 was repeated therefore it is a non function.
❅☃ Option C
-4
6
6
7
9
6 was again repeated. Non function.
❅☃ And lastly, D.
-16
-11
10
10
16
10 was reapted. Non function.
❅☃ Your answer is A