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For two distinct inputs $x_1$ and $x_2$, the secant slope is $\frac{f(x_2)-f(x_1)}{x_2-x_1}$. It compares the change in output with the change in input.

Conditions: The inputs $x_1$ and $x_2$ are distinct.; The function $f$ is defined at both $x_1$ and $x_2$.

For two distinct inputs $x_1$ and $x_2$, the secant slope is $\frac{f(x_2)-f(x_1)}{x_2-x_1}$. It compares the change in output with the change in input.

Conditions: The inputs $x_1$ and $x_2$ are distinct.; The function $f$ is defined at both $x_1$ and $x_2$.