Mathematics - Functions - Linear - Slope and y-intercept - Slope Formula and y-intercept

8 steps: (1) SLOPE = rise/run = (change in y)/(change in x) = (y₂-y₁)/(x₂-x₁). (2) Example: line through (1,2) and (3,8). Slope = (8-2)/(3-1) = 6/2 = 3. Rises 3 for every 1 right. (3) Positive slope: line goes UP. Negative: goes DOWN. Zero: HORIZONTAL. Undefined: VERTICAL. (4) Y-INTERCEPT: where lin