91L10 Rectangular Coordinates; Graphs of Equations; Circle The Rectangular Coordinate Systemis formed by the x−axis and y−axis. A plane with the rectangular coordinate systemis called the coordinate planeor xy-plane. This plane has four quadrants: For each point Pin the xy-plane, there is a corresponding ordered pair (,)x y, where xand yare called coordinates of P, and we write ( ,)Px y=. Example: Determine the quadrant(s) in which (,)x yis located if 0x<and 0y<2x>and 3y=
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