Equation of line passing through two points
=
Now , we will find first equation of line which passes through (-4,4) and (-2,0) is :

The Second line which passes through (0,-4) and (2,-8) is :

So equation of line passing through (-4,4) , (-2,0) ,(0,-4) and (2,-8) is :(All points are collinear, so there will be unique line passing through these four points.)
2 x + y + 4=0