(3) Find the slope of the tangent line to the parabola y = x + 9x at the point (-3, -18) by using the following parameters. (i) The tangent line to the curve y = (x) at the point A(a, f(:)) is the line through P with slope m = lim R(x) - f(a) provided that this limit exists. x - 2 m = (i) The expression of slope is m = lim fe + h) - Me) h+0 h m = (b) Find an equation of the tangent line in part (2)