Answer:
1
Explanation:
In a function, no two points can have the same x-coordinate.
The points in the function have x-coordinates:
2
12
-1
0
No other point can have the same x-coordinate as one of those four.
The choices are:
-1
1
2
12
-1, 2, 12 are already in the given points.
The only value not there yet is 1.
Answer: 1