7. A tangent line to the cubic y = x3 passes through the point (0, -2). Find the equation of this tangent line. 8. The graph depicts a straight piece of track (y = mx) designed to meet up tangentially with a major railway line (y = x2 + 4) at point P. What are the coordinates of P? y y =x +4 P(a,a + 4) 4 y =mx