Question

Where do you put the tangent line in a slope

Answer 1

 First plug in the x value into the derivative to get the slope. The second step is to plug the given x-value into the derivative of f(x). The value you get is the slope of the tangent line. Now you want to find the y-value of the point with the original equation which means the third step is to find the y-value of the point! That should be it!