All ordered pairs, (a,b) such that a > 0 and b > 0
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The fourth quadrant
The point (8,0) is on an axis (abscissa axis or x-axis) and is therefore not in a quadrant.
The meaning of the question is not at all clear. Quadrant IV contains points whose x-coordinate is positive and the y-coordinate is negative. So what is meant by the "point" being negative? Also, quadrant IV is not an operation. So what is meant by its converse?
In the second quadrant.
Quadrant I ( + , + ) Quadrant II ( - , + ) Quadrant III ( - , - ) Quadrant IV ( + , - )