1. The problem statement, all variables and given/known data if the tangent line to the graph of y=f(x) at (2.3) has an equation x-y+1=0, then f'(2) =? 3. The attempt at a solution We did these problems in one small session at the beginning of the semester, but my notes aren't clear and I am not sure where to begin. Do I just take the first derivative of the equation and then find f'(2)?