Consider the function and the value of a. -8 f(x) = a=6 x-1 (a) Use mtan f(a+h)-f(a) to find the slope of the tangent line mtan = f'(a). h-0 h mtan x (b) Find the equation of the tangent line to fat x = a. (Let x be the independent variable and y be the dependent variable.) X = lim