Slope = \(\frac{dy}{dx}\)
\(2xdx + xdy +ydx +2ydy = 0\)
\(2(1)dx + (1)dy + (1)dx +2(1)dy = 0\)
\(3dx + 3 dy = 0\)
\(dy = -dx\)
\(\frac{dy}{dx} = -1\)