7 is not because a couple x values were repeated
8 is not because the x value -2 was used for two y values
9 is not because a couple x values were used for more than one y value
10 is a function is x alue is only used once
hope this helps :)
{y|y is a real number}
Answer:
Step-by-step explanation:
5
-1+(1)= 0
0+(4)=4
1+4=5
