QUESTION $1$

A parametrization for the line through the point $(a,b)$ having slope $m$ is

a$.x=a+t,y=b,-y=b+mt,x=a+t,-$

$e.x=a+t,y=b,-x=a+t,y=mt,-$

$d.y=b+mt,x=a+t,-$

$e.x=a+t,y=b,-x=t,y=mt,-$

$c.x=a+t,y=mt,-$

$d.y=b+mt,x=a+t,-$

$e.x=a+t,y=b,-x=t,y=b+mt,-$

$b.x=t,y=mt,-$

$c.x=a+t,y=mt,-$

$d.y=b+mt,x=a+t,-$

$e.x=a+t,y=b,-$