# Parallel Lines

Parallel lines have the same **slope**.

Mathematically, we say if one line has slope
*m*_{1} and another line has slope
*m*_{2} then the lines are **parallel** if

m_{1}=m_{2}

## Interactive Graph

You can explore the concept of parallel lines in the following JSXGraph (it's not a fixed image).

**Drag** either point `A` or point `B` to explore slopes of parallel lines.

You can move the graph up-down, left-right if you hold down the "Shift" key and then drag the graph.

If you get lost, you can always refresh the page.