How do you draw line parallel to line mn?

To draw a line parallel to line MN, you can use a straightedge and a pencil. Start by marking a point anywhere on the paper and label it as point A. Then, place the straightedge on point A and line MN, ensuring that the straightedge is parallel to line MN. Next, draw a line extending from point A along the straightedge, and this new line will be parallel to line MN.