Question 1165929
Solve the following simultaneous equations
a. 2x+3y-z= 13
x -2y+2z=-3
3x+y +z =10
--------------------
2x+3y-z= 13 ----- Eqn 1
3x+y +z =10 ----- Eqn 3
--------------------------- Add
5x + 4y = 23
===================
4x +6y-2z= 26 ----- Eqn 1 times 2
 x -2y+2z=-3  ----- Eqn 2
------------------------------ Add
5x + 4y = 23
Same result ---> no unique solution.
<pre>
| 2   3  -1|
| 1  -2   2|
| 3   1   1|
</pre>
Det = 2*(-2*1 - 1*2) - 3*(1*1 - 3*2) -1*(1*1 - 3*-2) = -8 + 15 - 7 = 0
No solution.
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b. x-3y+z = -2
x+y-2z = 4
-2x+y+z= 12