This calculus 1 video tutorial explains how to find the equation of a tangent line using derivatives.

Here are some other useful calculus videos on derivatives:

Limits & Derivatives:

https://www.youtube.com/watch?v=-aTLjoDT1GQ

Product Rule For Derivatives:

https://www.youtube.com/watch?v=17X5g9QArTc

Quotient Rule For Derivatives:

https://www.youtube.com/watch?v=8jVDEcQ0wXk

Chain Rule For Derivatives:

https://www.youtube.com/watch?v=HaHsqDjWMLU

Derivatives of Exponential Functions:

https://www.youtube.com/watch?v=yg_497u6JnA

Derivatives of Logarithmic Functions:

https://www.youtube.com/watch?v=Dp9sgIvaKPk

Derivatives of Radical Functions:

https://www.youtube.com/watch?v=B1YkgNDbx5o

Simplifying Derivatives:

https://www.youtube.com/watch?v=3lUOtjkqfQo