Final answer:
If we assume a > 0, b > 0, and y > 0, then the values of a, b, and y must all be positive.
Step-by-step explanation:
If we assume a > 0, b > 0, and y > 0, with the given conditions x = y and x = 0, then the following must be true:
The value of a is positive.
The value of b is positive.
The value of y is positive.