Given equation x^2/9 + y^2/4 = 1. Determine the two points on the ellipse having a tangent line passing through the point (0,3). Cant seem to figure this one out? I have found the derivative of the slope which is -4x/9y. I dont know how to use that slope in order to find a tangent line that passes through the points (0,3), which is not located on the orignal ellipse?