Given the points P(4,−5), Q(−3,2), R(0,−7) and S(−6,0), answer the following questions.
(i) Write separately the abscissa and the ordinate of each point.
(ii) For every point, state whether its abscissa is positive, negative or zero and whether its ordinate is positive, negative or zero.
(iii) Identify the quadrant or the axis on which each point lies. Give a short reason based on the signs of its coordinates.
(iv) Summarise, in one or two sentences, the rule that connects the signs of the coordinates with the four quadrants of the Cartesian plane.