In this lesson, you will learn what the slope of a line is in algebra and how to calculate it. We first learn that the slope of a line is defined to be how much the line goes up (rise) divided by how much horizontal distance it covers (run). A line slanted at 45 degrees would then have a slope of 1. A horizontal flat line has a slope of zero. A vertical line has a slope of infinity (undefined). More Lessons: http://www.MathAndScience.com Twitter: https://twitter.com/JasonGibsonMath