Suppose parametric equations for the line segment between $(9,6)$ and $(5,6)$ have

the form:

$($z$($t$)=$ a $+$ bt

u$($t$)=$ c $+$ dt

If the parametric curve starts at $(9,6)$ when t $=0$ and ends at $(5,6)$ at t $=1,$

then find a$,$ b$,$ c$,$ and d$.$

a