Find f' (x) and find the equation of the line tangent to the graph of f at x = 1. x - 9 f(x) = 8x - 1 . . . 71 f' (X) = (8x - 1) 2 The equation of the line tangent to the graph of f at x = 1 is y =Find f' (x) and find the equation of the line tangent to the graph of f at x = 1. f(x) = (2+ 5x)(6 - 5x) f'(x) = 5( -10x + 4) y=