7 The parametric equations of a curve are \(x = \frac { t + 2 } { t + 1 } , y = \frac { 2 } { t + 3 }\).
- Show that \(\frac { \mathrm { d } y } { \mathrm {~d} x } > 0\).
- Find the cartesian equation of the curve, giving your answer in a form not involving fractions.