Consider the parabola y = 5x - x2. (a) Find the slope of the tangent line to the parabola at the point (1, 4). (b) Find an equation of the tangent line in part (a). (c) Graph the parabola and the tangent line. y 201 20/ 10 10 -20 -10 10 X 20 -20 -10 10 20 - 10 -10 20 -20