The ordered pair (-9, -4) is located in the third quadrant. In the Cartesian coordinate system, the quadrants are defined as follows:
- Quadrant I: x > 0 and y > 0
- Quadrant II: x < 0 and y > 0
- Quadrant III: x < 0 and y < 0
- Quadrant IV: x > 0 and y < 0
Since both coordinates of the ordered pair (-9, -4) are negative, it falls into the third quadrant.