David wants to purchase some pens. The pens he likes cost $2 each, not including tax. This is represented by the graph below.
Write an equation for the graph of the line.
![David wants to purchase some pens The pens he likes cost 2 each not including tax This is represented by the graph below Write an equation for the graph of the class=](https://us-static.z-dn.net/files/ddd/564dcd49878dcd69778340d9340ab8b0.png)