posted by Diana .
1. Consider the following equation.
xy + 7x + 5y = –8
(a) Differentiate both sides with respect to x to complete the following.
( blank )y ' + y + blank =0
(b)Solve for y ' in terms of x and y.
(c) Calculate dy/dx at the point (4,-4).
Can anyone help me on this questions I'm struggling so badly....