Every straight line has slope usually designated by the letter m. Divide by B to simplify. The general equation for a straight line.
To find the slope of a line given the equation of the line first write it in slope-intercept form.
To find the slope you divide the difference of the y-coordinates of 2 points on a line by the difference of the x-coordinates of those same 2 points. Designate the X and Y value for points 1 and 2. Use the formula to find the slope between the two points. The b value called the y-intercept is where the line crosses the y-axis.