The plane determined by the points 
, 
, and 
and the line passing through the
points 
and 
intersect in a point which can be determined by solving
the four simultaneous equations
 |  |  |
(1)
|
 |  |  |
(2)
|
 |  |  |
(3)
|
 |  |  |
(4)
|
for 
,
,
,
and 
,
giving
 |
(5)
|
This value can then be plugged back in to (2), (3), and (4) to give the point of intersection 
.
