tangent line equation help me I am having trouble finding the solution to find an equation of the tangent line to the graph $$y=x^4 - \ln x + 1$$ at the point $(1,2)$.

We take the derivative of the function and substitute x=1. The derivative = $4x^3 - \frac{1}{x}$ 
For $x=1$ The value is: $4 - 1 = 3$
Thus, the slope is 3, and the line passes through the point (1,2)
(2) How does this determine a line?