Given two points $P(1,4)$ and $Q(5,2),$

vec$(PQ)=$

vec$(QP)=$

The parameterization of the line from $P$ to $Q$ with parameter $0t1$ is

$x(t)=$

$y(t)=$

The parameterization of the line from $Q$ to $P$ with parameter $0t3$ is

$x(t)=$

$y(t)=$