Identify+the+Slope+of+Lines+Parallel+to+the+Axis


 * How to Identify the Slope of Lines Parallel to the Axis **

On a Cartesian Plane, there are two axes, the x axis and the y axis. As you probably know, the formula for calculating slope is rise/run. Because of this, if a line is parallel to the x axis, this means that the slope must be zero because there is no increase in height. If the rise is zero, no matter what the run is, the slope will always be zero, because whenever you divide zero, you get zero.

But, if the line is parallel to the y axis, the slope will be undefined. This is because the run would be zero, because a vertical line does not move to the side. It is undefined because you cannot divide by zero.