Let f(a) = 2.7ac - 2.5x. Use the difference quotient and h = 0.001 to estimate the slope of the tangent line at x = 9. What is the slope ground your answer to one decimal place)? m What is the y-value at a - 9? f(9) Use the above (rounded) slope and y-value to write the equation of the tangent line to the graph of f(x at x = 9. Write your answer in ma + b format. y