Answer:
Point A: Quadrant 1
Point B: Either Quadrant 2 or 3
Explanation:
Quadrant 1 is positive x and y
Quadrant 2 is positive y and negative x
Quadrant 3 is negative x and y
Quadrant 4 is negative y and positive x
Point A is both positive x and y
Point B has a y=0 and negative x, so it is between Quadrants 2 and 3
(hope this helps :P)