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The display shows in blue the straight line graph of the equation y = mx+c.

You can alter this graph by using the sliders to change the values of m and c.

Choose a red graph:

Now use the sliders to match the lines.

Software/Applets used on this page

This page uses JSXGraph
JSXGraph is a cross-browser library for interactive geometry, function plotting, charting, and data visualization in a web browser. It is implemented completely in JavaScript, does not rely on any other library. It uses SVG and VML and is fully HTML5 compliant.



A statement that two mathematical expressions are equal.


A rule that connects one value in one set with one and only one value in another set.


A diagram showing a relationship between two variables.
The diagram shows a vertical y axis and a horizontal x axis.


To mark a point on a graph accurately by using its coordinates.


The type of line produced by a linear equation.

Full Glossary List