Use implicit differentiation to find an equation of the tangent line to the curve 5ry" + 2xy = 63 at the point (9, 1). The equation defines the tangent line to the curve at the point (9, 1).Use implicit differentiation to find the points where the parabola defined by x' - 2xy + y' + 8x - 12y + 36 = 0 has horizontal and vertical tangent lines. The parabola has horizontal tangent lines at the point(s) The parabola has vertical tangent lines at the point(s)