Slope = \(\frac{dy}{dx}\)
\(2xdx + 2ydy = 0\)
At \((3,4)\), \(2(3)dx + 2(4)dy = 0\)
\(6dx + 8dy = 0\)
\(8dy = -6dx \)
\(\frac{dy}{dx} = \frac{-3}{4}\)