<PRE><B>Question 102281</B>
 x  – 2y    0z  =  4  
2 x – 3 y + 2 z = – 2 
4 x – 7 y + 2 z = 6
-------------------
x = 2y+4
Substitute to get:
2(2y+4)-3y+2z = -1
4(2y+4)-7y+2z = 6
-----------------
Simplify:
x = 2y+4
y + 2z = 9
y + 2z = -2
---------------
The last two equations indicate the system is inconsistent.
Two of the equations represent parallel planes.
There is no intersection of the three planes represented
by the original three equations.
===================
Cheers,
Stan H.</PRE>