<PRE><B>Question 445381</B>
.
What are the solutions to

6x+3y+z=19
x-3y+2z=21
17x-2y+3z=86
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The solution in the post by @mananth x = 4.27, y = -9.99,  z = 3.37  is incorrect.


To check, I substituted these values into first equation and got the value of the left side -0.98, 
different from 19.


This is just enough to refute the solution by @mananth.


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