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.
1
1 only
2
2 only
3
Both 1 and 2
4
Neither 1 nor 2 nor 3