Coordinate Geometry

Just like we need house number

Just like we need house number AND street name to locate a house, we need TWO pieces of information to locate a point in a plane. One reference line i

Step

Step-by-step construction: 1) Take horizontal number line X'X (x-axis), 2) Take vertical number line Y'Y (y-axis), 3) Place them perpendicular so they

The axes divide the plane into

The axes divide the plane into four quadrants: I(+,+): Both coordinates positive - top right, II(-,+): x negative, y positive - top left, III(-,-): Bo

Every point P has coordinates (x

Every point P has coordinates (x, y) where: x-coordinate (abscissa) = perpendicular distance from y-axis (positive if right of y-axis, negative if lef

Origin O

Origin O: (0, 0) - intersection of both axes. Points on x-axis: (a, 0) where a is any real number - y-coordinate is always 0. Points on y-axis: (0, b)