Question 813409
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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