M is the slope of the straight line. In this case the equation of the line is y b y b. Undefined slope if a line y mx b y m x b is vertical.
The diagram shown below illustrates this.
What does it stand for. Identify the slope m. Y a bX Now here we need to find the value of the slope of the line b plotted in scatter plot and the intercept a. In this case the equation of the line is y b y b.