The equations are .

Graph each line on a coordinate planes.

perpendicular lines: Two nonvertical lines are perpendicular if the product of their slopes is  1.

Observe the above graph, the line equations not perpendicular.

Parallel lines: Two nonvertical lines are parallel if they have the same slope.

The line equations slopes are equal, so the line equations are parallel.

The line equations are parallel not perpendicular lines.