In GRE Mini Exam 1, Question No.5 of quants, I think the answer should be two because there is one more solution to the equation that we didn’t consider and that is (0,-4)
Please correct me if I am wrong
The number zero is neither positive nor negative. In GRE, if they say “non-negative”, you can consider 0, but if they say “positive”, you shouldn’t consider 0.