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Slope of a tangent line PART 1. Using the definition of derivative, f' (x) = lim f ( x th) - f(z) , find the slope of the tangent to the curve at the given point. h-+0 h f(x) = 13x2+ 13x + 12 ; x = 9 The slope of the tangent to the curve at x = 9 is Enter a numeraical value for the slope. PART 2. The equation of the line tangent to the curve at x = 9 is Type answer in form y = max + b