(a) The x-coordinate is positive and y - coordinate is negative. So, point (3,−8) lies in the IV quadrant.
(b) The x-coordinate is negative and y-coordinate is negative. So, point (−1,−3) lies in the III quadrant.
(c) The x-coordinate is positive and y-coordinate is positive. So point (2,5) lies in the I quadrant.
(d) The x-coordinate is negative and y-coordinate is positive. So, point (−7,3) lies in the II quadrant.