The two axes slice the plane into four fields, numbered one through four going counterclockwise, and the plus or minus signs instantly tell you which field you're in.
Module goal. Stretch the number line and intervals from last stage out into the plane, and learn how a single pair of numbers can lock down any spot on a flat surface
eastmath.com · 20.1 Pinpointing a Point with Coordinates · 20.1.4 The Four Quadrants and Points on the Axes