_{D}in terms of k

_{0}, k

_{1}, k

_{2}and k

_{t}

where E = V

_{D}- V

_{M}, I = Ek

_{1}, T = k

_{0}I, V

_{t}= k

_{t}T and V

_{m}= k

_{2}V

_{t}

My attempt:

T = k

_{0}I where I = Ek

_{1 }therefore T = k

_{0}Ek

_{1}where E = V

_{D}- V

_{M}hence T = K

_{0}(V

_{D}- V

_{M})K

_{1}

Also we know that T = V

_{t}/k

_{t}where V

_{t}= V

_{M}/k

_{2 }therefore T = V

_{M}/(k

_{2}k

_{t)}hence V

_{M }= Tk

_{2}k

_{t }and substituting V

_{M }= Tk

_{2}k

_{t}into T = K

_{0}(V

_{D}- V

_{M})K

_{1}

we have T = K

_{0}(V

_{D}- Tk

_{2}k

_{t})K

_{1}expanding brackets: T = K

_{0}K

_{1}V

_{D}- K

_{0}k

_{1}Tk

_{2}k

_{t }I've tried various rearragements of this but don't seem to come up with T/V

_{D }can anyone show me where I'm going wrong?

I'm really stuck

Thanks!