Question 204670
Hi all, Im still having trouble with these graphing problems, I need to; 
Find equation of the line plane through the three points:
(1,-1,-2),(2,1,2) and (-2,0,-7) 
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Do you mean the plane?  3 points determine a plane.
The best way to do these, imo, is to use a matrix.
|x +y +z 1|
|1 -1 -2 1|
|2 +1  2 1| = 0
|-2 0 -7 1|
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(the + signs are for spacing)
2x + y - z = 3 is the plane.
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As a check, all 3 points fit the equation.