Answer all parts relating to the position of points on the Cartesian plane.
(a) State the sign conditions on the abscissa and ordinate for a point to lie in each of the four quadrants.
(b) A point P(x,y) is such that x<0 and y>0. Identify the quadrant in which P lies and give a brief justification based on the signs of its coordinates.
(c) Explain why a point whose coordinates satisfy x<0 and y<0 cannot lie on any axis of the Cartesian plane.