How far a point sits from the x-axis is just |y|, its distance from the y-axis is |x|, and its distance from the origin you piece together with the Pythagorean theorem.
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 · 20.1.5 Coordinates and Distance