Find (a) the slope of the curve at the given point P, and (b) an equation of the tangent line at P. y= -2-7x2: P(5, - 177). (a) The slope of the curve at P is (Simplify your answer.) (b) The equation for the tangent line at P is (Type an equation.)Find the limit. x2 +7 -4 lim X - 3 X-3 2+7-4 lim (Type an integer or a simplified fraction.) x - 3 X-3