Can you help answer these three questions i keep get them wrong

Entered Answer Preview Result 225 225 incorrect The answer above is NOT correct. (1 point) For the equation given below, evaluate ay dx at the point (1, ). =x- 4 x - 5y dy = dx at (1, ) 225At least one of the answers above is NOT correct. (1 point) The graph of the equation x2 + xy + y2 = 7 is an ellipse lying obliquely in the plane, as illustrated in the figure below. y V d a. Compute _y. dx dy = -(2x+y)/(x+2y) . dx b. The ellipse has two horizontal tangents. Find an equation of the lower one. The lower horizontal tangent line is defined by the equation y = -(28/3)A(1/2) . c. The ellipse has two vertical tangents. Find an equation of the leftmost one. The leftmost vertical tangent line is defined by the equation x = -(28/3)/\\(1/2) . d. Find the point at which the leftmost vertical tangent line touches the ellipse. The leftmost vertical tangent line touches the ellipse at the point (-sqrt(n/sqrt(3)) . Hint: The horizontal tangent is of course characterized by % = 0. To find the vertical tangent use symmetry, or solve 3: = 0