How can the coordinates of two points on a line tell you if the line is horizontal or vertical?

A horizontal line is one the goes left-to-right, parallelto the x-axis of the coordinate plane. All points on the line will have the same y-coordinate. In the figure above, drag either point and note that the line is horizontal when they both have the same y-coordinate. A horizontal line has a slopeof zero

Step-by-step explanation:

hope it works