The curve defined by the equation {{MATH_50}} is not a graph of a function. If we solve for {{MATH_51}}, we obtain two solutions: {{MATH_52}} and {{MATH_53}}. The point {{MATH_54}} lies on the graph of the function {{MATH_55}}. Let's compute the derivative of {{MATH_56}}. {{MATH_57}} Therefore, the slope of the tangent line at the point {{MATH_58}} is given by {{MATH_59}}