## Geometry: Common Core (15th Edition)

$m = -5$
We are given the two points $(1, 1)$ and $(2, -4)$. Let's use the formula to find the slope $m$ given two points: $m = \frac{y_2 - y_1}{x_2 - x_1}$, where $(x_1, y_1)$ and $(x_2, y_2)$ are points on the line. Let's plug in the values into this formula: $m = \frac{-4 - 1}{2 - 1}$ Subtract the numerator and denominator to simplify: $m = \frac{-5}{1}$ Simplify by dividing the numerator by the denominator: $m = -5$