calculus subject

4. Let C be the curve defined by C: 7x2y3 - 5xy + 4x + 2y = 10. (a) (4 points) Find dy/dr at the point (-1, 1) using implicit differentation. (b) (3 points) Find dy/dx at the point (-1, 1) using partial derivatives. (c) (3 points) Find an equation of the line tangent to the C at the point (-1, 1)