Question: how to find the slope of a line that passes through 2 points?
Answer: Step One: Identify two points on the line. In this example we are given two points, (15, 8) and (10, 7), on a straight line.
Step Two: Select one to be (x1, y1) and the other to be (x2, y2). It doesn't matter which we choose, so let's take (15, 8) to be (x2, y2). ... 
Step Three: Use the equation to calculate slope.