SOLUTION: really stuck on this equation with three variables. 3x=-12 2x-y=3z=-1 3x+4-z=-7

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Question 813409: really stuck on this equation with three variables.
3x=-12
2x-y=3z=-1
3x+4-z=-7
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

3x=-12  0r x = -4

 2x-y+3z=-1

 3x+4-z=-7



-8-y+3x = -1    |Substituting x = -4

-12-y -z = -1



-y + 3z = 7

-y -  z = 11



-y + 3z = 7

y  + z = -11   |Multiplying 2nd EQ by -1

   4z = -4

    z = -1   and y = -10