Final answer:
The point located in the third quadrant of the coordinate plane is A. (-1, -9), as both the x and y coordinates are negative, which is the defining property of the third quadrant.
Step-by-step explanation:
The point located in the third quadrant of the coordinate plane is A. (-1, -9). To determine this, one must first understand the properties of the coordinate plane quadrants:
- First Quadrant: Both x and y are positive.
- Second Quadrant: x is negative, y is positive.
- Third Quadrant: Both x and y are negative.
- Fourth Quadrant: x is positive, y is negative.
The third quadrant is where both the x (horizontal) and y (vertical) coordinates are negative. Looking at the options provided:
- A. (-1, -9): Both coordinates are negative.
- B. (1, -9): x is positive, y is negative.
- C. (-1, 9): x is negative, y is positive.
- D. (1, 9): Both coordinates are positive.
Only option A has both coordinates in the negative, which places it in the third quadrant.