Answer:
To calculate the slope of a line you need only two points from that line, (x1, y1) and (x2, y2). There are three steps in calculating the slope of a straight line when you are not given its equation.
Step-by-step explanation:
Step One: Identify two points on the line. Step Two: Select one to be (x1, y1) and the other to be (x2, y2).