Answer:
A
Step-by-step explanation:
A function is an equation which results in 1 y value for every x value,
Therefore lets eliminate the answers that have repeating x values
A - This is a function, all x values have one output (y value)
B - This is not a function, the x value of 1 repeats meaning theres
more than 1 corresponding output or y value
C - This is not a function, the x value 0 repeats
D - This is not a function, the x value(s) -1 and -2 repeat
Therefore A represents a function and the others do not.
Hope this helps
