4 The parametric equations of a curve are
$$x = t ^ { 2 } + 1 , \quad y = 4 t + \ln ( 2 t - 1 )$$
- Express \(\frac { \mathrm { d } y } { \mathrm {~d} x }\) in terms of \(t\).
- Find the equation of the normal to the curve at the point where \(t = 1\). Give your answer in the form \(a x + b y + c = 0\).