SUPER FACTS!!!
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length. The x-axis is horizontal and the y-axis is vertical or perpendicular to the x-axis. In the drawing below and to the right there are four quadrants; I, II, III, and IV. Quadrant I is (x,y), quadrant II is (-x, y), quadrant III is (-x, -y) and quadrant IV is (x, -y).
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length. The x-axis is horizontal and the y-axis is vertical or perpendicular to the x-axis. In the drawing below and to the right there are four quadrants; I, II, III, and IV. Quadrant I is (x,y), quadrant II is (-x, y), quadrant III is (-x, -y) and quadrant IV is (x, -y).