Exercise a b and c. Recognize which of the following equations represent ellipses, write them in the canonical form and determine if the foci belong to the x axis or the y axis. N11, 12 AND 13 Given the equation of the ellipse, in each of the following cases, it determines the measurement of the semi-axes, the coordinates of the vertices, those of the foci and the eccentricity, and represents the curve graphically.​