# How do I find the secant line through two points?

Given two points: $A \left({x}_{A} , {y}_{A}\right)$ and $B \left({x}_{B} , {y}_{B}\right)$ the line that passes through them is:
$\frac{y - {y}_{A}}{{y}_{B} - {y}_{A}} = \frac{x - {x}_{A}}{{x}_{B} - {x}_{A}}$.