7 The equation of a curve is
$$y ^ { 3 } + 4 x y = 16$$
- Show that \(\frac { \mathrm { d } y } { \mathrm {~d} x } = - \frac { 4 y } { 3 y ^ { 2 } + 4 x }\).
- Show that the curve has no stationary points.
- Find the coordinates of the point on the curve where the tangent is parallel to the \(y\)-axis.