Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to ...

Parallel lines are a fixed distance apart and will never meet, no matter how long they are extended. Perpendicular lines are created when a vertical and horizontal line meet.

Graph forms All vertical line graphs have an equation of the form: x = c For example: x = 1, x = 3, x = 4, etc All horizontal line graphs have an equation of the form: y = c For example: y = 3, y ...