Solve {l}{y=3+4t+2t^2}{z={(d/dt{{(y)}})}}{a=z}{text{Solvefor}btext{where}}{b=a}

$$\left. \begin{array} { l } { y = 3 + 4 t + 2 t ^ {2} }\\ { z = {(\frac{d}{dt} {{(y)}})} }\\ { a = z }\\ { \text{Solve for } b \text{ where} } \\ { b = a } \end{array} \right.$$

Solve for y, t, z, a, b

$$b=0$$