# Introduction to Derivatives

*Prerequisites Required-* Basic Mathematics

Suppose we have a basic linear function, $f(x) = 4x + 2$

The slope of this function is $4$ (if the input $x$ increases by 1, the output increases by $4$).

The **derivative** of a function is its slope (change in output per change in input). This calculation is very easy for linear functions because the slope is the same everywhere.

For the function $f(x) = 4x + 2$, its slope with respect to $x$ is 4.