For each function f(x) perform steps (a) – (d):
(a) calculate slope secant f (x + h) − f (x)
= ---------------------
h
(b) determine slope tangent = limit slope secant h→0
(c) evaluate slope tangent at x = 2
(d) find the equation of the line tangent to the graph of f at (2, f(2) )
1st function: f(x) = 3x-7
2nd function: f(x) = x^2 + 3x
