In the Cartesian coordinate system:
The first quadrant has both \( x>0 \) and \( y>0 \).
The second quadrant has \( x<0 \) and \( y>0 \).
The third quadrant has \( x<0 \) and \( y<0 \).
The fourth quadrant has \( x>0 \) and \( y<0 \).
Since the given point \( P(x, y) \) has \( x<0 \) and \( y>0 \), the point lies in the second quadrant.