7 The equation of a curve is
$$2 x ^ { 2 } + 3 x y + y ^ { 2 } = 3$$
- Find the equation of the tangent to the curve at the point \(( 2 , - 1 )\), giving your answer in the form \(a x + b y + c = 0\), where \(a , b\) and \(c\) are integers.
- Show that the curve has no stationary points.