An ellipse or hyperbola uses the general form ax2+cy2+dx+ey+f=0. solving for 5 unknowns (a, b, c, d, e, f) requires 5 equations, needs 5 points given. but if one of the coefficients is divided out (a or c), then only 4 coefficients remain and only 4 points are needed. x2+cy2+dx+ey+f=0 given 4 points on a vertical ellipse (3.75, 0), (0, 2.71), (1, -7), and (-1, -5.725). select the missing coefficients (answers have been rounded to the nearest tenth).