Graph board guide

Hide a graph and show it:

Step 1 of 7

Each row of the list is something on the board; its dot has the graph’s colour.
A click on the dot hides the graph or shows it again.

The bar zooms in and out; the third button brings back the view at first.
On a touch screen, two fingers drag the board and pinch it.
The numbers on the axes follow the zoom.

$\displaystyle A$ is outside the view: an arrow at the edge points to it, with its coordinates.
A click on the arrow takes the view to the point.

A marked point sits on the nearest line of a fine grid; zoom in for a finer one.
Each point is a row of the list too, with its coordinates.
Check says how many of the points asked for are found – never where they are.

✗ marks a point that is not one of the points asked for.
× in its row deletes it.
A point can also be dragged to another place.

The line is drawn, but its formula is hidden: $\displaystyle {y}={?}$ .
Your function is drawn as you write it, in a colour of its own.
Check marks it ✓ when its graph is the same as the line’s.

An equation in $\displaystyle x$ and $\displaystyle y$ is drawn too: its graph is all the points that solve it.
= goes on to the right side.
Check marks it ✓ when its graph is the same as the line’s.