If a and b are integers, when is -1/a positive?

it would be positive when a is a negative number

A negative divided b a negative is positive.

what about 1/ab, when is that positive?

I think you posted this question already but Ill answer again.

In order for 1/ab to be positive meaning it is greater the zero the denominator must be positive since the numerator is positive.

Since both a and b are in the denominator to get a positive number a&b both have to be positive or they both have to be negative.

Did I explain clearly?

Yes, thank you.

Your welcome

To determine when -1/a is positive, we need to consider the sign of the numerator (-1) and the denominator (a).

For a fraction to be positive, either both the numerator and the denominator must be positive, or both must be negative.

In this case, the numerator is -1, which means it is negative.

To determine the sign of a, we need to consider the value it takes. If a is positive, then -1/a will be negative since we have a negative numerator and a positive denominator.

On the other hand, if a is negative, then -1/a will be positive since we have a negative numerator and a negative denominator.

Therefore, -1/a is positive when a is negative.