Does a negative minus a negative minus a negative equal a positive?

yes

Not necessarily. Examples: -1 - (-5) = -1 + 5 = 4, which is positive, but -10 - (-3) = -10 + 3 = -7, a negative. So it depends on the numbers used.

Suppose x and y are two POSITIVE numbers so that -x and -y are negative. Then a negative minus a negative = (-x) - (-y) = -x +y If x > y the answer is negative If x = y the answer is zero If x...

-(-1)-1=-1

It depends on the values of the negatives. if the second number has larger magnitude the answer is positive if not it remains negative. i.e. -3 - (-4) = -3 + 4 = 1 but -3 - (-2) = -3 + 2 = -1