A friendlier way into the coordinate plane.

Who this is for

Anyone learning or relearning the coordinate plane — high school students working through algebra, homeschool families looking for something more engaging than a worksheet, teachers who want a classroom-ready visual tool, and adults dusting off math they haven't touched in a decade. If you've ever squinted at a graph and thought I bet this would click if I could just move things around, this site is for you.

What's inside

Every section on the homepage is a small lesson paired with an interactive widget. Drag markers on the number line. Plot a point on the grid. Change the slope and watch a line rotate. Type a function and see the graph redraw. It's designed so you can read a little, poke at something, and see the math respond.

There's also a full graphing calculator at /calculator — plot multiple functions, drop sliders on parameters, pan and zoom, and read off zeros, extrema, and intersections. And when you're ready to actually use what you've learned, there's Coordinate Battleship: a two-player game where you fire (x, y) coordinates at your opponent's hidden ships.

The philosophy

Math notation is a compression. It's the shortest version of an idea, not the friendliest. Plane & Point unpacks the compression — visually, interactively, and with as little jargon as possible. When a definition appears, it's followed by something you can drag. When a formula shows up, you can watch what changes when its pieces move.

Nothing here is groundbreaking mathematically. The coordinate plane is 400 years old. What's new is the pacing: read a paragraph, move a slider, see the result, and keep going.

Who made this

Plane & Point is an independent project — no ads on lesson content, no accounts required, no data collected beyond simple anonymous analytics. If you'd like to say hello, spot a bug, or request a feature, get in touch.