Identify two distinct points ((x_1, y_1)) and ((x_2, y_2)).
Use (m = dfrac{y_2 – y_1}{x_2 – x_1}).
If given a graph: pick two clear points on the line and apply (m = dfrac{Delta y}{Delta x}).
If given an equation in slope-intercept form (y = mx + b): the slope is (m).
If given a point and a slope (m): use (y – y_1 = m(x – x_1)) to confirm the slope.
If given an equation in standard form (Ax + By = C): rewrite as (y = mx + b) and read (m).
For a vertical line (x = k): slope is undefined.