If $x - y = 8$ , then which of the following must be true?

1. Both $x$ and $y$ must be positive for any value of $x$ and $y$ .
2. If $x$ is positive, $y$ must be negative for any value of $x$ and $y$ .
3. If $x$ is negative, $y$ must be positive for any value of $x$ and $y$ .

Select the correct answer using the code given below.