Suppose parametric equations for the line segment between $(-2,-10)$ and $(9,2)$ have the form:

$x=a+bt$

$y=c+dt$

If the parametric curve starts at $(-2,-10)$ when $t=0$ and ends at $(9,2)$ at $t=1,$ then find $a,b,c,$ and $d.$

$a=$

$b=$

$c=$

$d=$