Suppose parametric equations for the line segment between $(2,0)$ and $(0,0)$ have the form:

$x(t)=a+bt$

$y(t)=c+dt$

$If$ the parametric curve starts $at(2,0)$ when $t=0$ and ends $at(0,0)att=1,$ then find $a,b,c,$ and $d.$

$a=$

$b=$

$c=$

$d=$