Question 918602
All three points must satisfy the equation.
{{{2x+2y-z=-4}}}
(0,0,4)
{{{2(0)+2(0)-4=-4}}}
{{{-4=-4}}}
True
(2,0,0)
{{{2(2)+2(0)-0=-4}}}
{{{4=-4}}}
False
So graph 1 is not a solution.
Do the same for the other three graphs until you get one that yield true for all three points.