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Step-by-step explanation:

Quadrant IV

Step-by-step explanation:

In Quadrant I the numbers are both positive.

In Quadrant II the number on the x-axis is negative while the number on the y-axis is positive.

In Quadrant III both numbers are negative.

In Quadrant IV the number on the x-axis in positive while the number on the y-axis is negative.

Since your plot point was (a, -b), the number in the y-axis is negative meaning it's located in Quadrant IV.