An equation that defines a straight line.

In this example the equation is **y = 2x + 1**

It could also be written **y − 2x = 1** or many other ways.

Try some different lines below:

An equation that defines a straight line.

In this example the equation is **y = 2x + 1**

It could also be written **y − 2x = 1** or many other ways.

Try some different lines below:

../geometry/images/geom-line-equn.js?mode=equn

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