3. A function y = f(x) is given implicitly by the equation: xy + 2y = 2x + 2 a. Find dy dx b. What is the equation of the tangent line to the graph of f(x) at the point (0, 1)? c. Find y dx 4. A function y = f(x) is given implicitly by the equation: 2 3 sin (x) - xy + xy = 4x - y a. Find dy dx b. Find dy dx