13.1 Slope equation: $m = \frac{y_2y_1}{x_2 x_1}$
Slope equation: $m = \frac{y_2y_1}{x_2 x_1}$
In this lesson, we will try to determine slope of a straight line with different methods, for example, riseoverrun and slope formula. We only need any two of the following things: a point on a line, the slope of the line or two points on the line, we can easily find the equation of the line by using this pointslope formula. However, if you have the graph of the line and only need to find the slop, using the riseoverrun is your best way to solve the question.
Basic concepts:
 Draw on coordinate planes
 Horizontal and vertical distances
 Representing patterns in linear relations
Related concepts:
 Parallel line equations
 System of linearquadratic equations
Lessons

4.
Given two points of a line, determining the slope using $m = (y_2  y_1) / (x_2  x_1)$

5.
Arrange the slopes from flattest to steepest.