Question

what is the formula for finding slope?
option 1: $\frac{y_2 - y_1}{x_2 - x_1}$
option 2: $ax + by = c$
option 3: $y = mx + b$

Explanation:

• $\frac{y_2 - y_1}{x_2 - x_1}$ calculates slope using two points $(x_1,y_1)$ and $(x_2,y_2)$.
• $Ax+By=C$ is standard linear form, not a slope formula.
• $y=mx+b$ is slope-intercept form, where $m$ is slope but it is not the formula to calculate slope from points.

Answer:

$\boldsymbol{\frac{y_2 - y_1}{x_2 - x_1}}$