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solving systems of equations with 3 variables

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abczyx:
can someone please solve the following 2 questions.

1)                                  x+y-z = 9
                                    3x+4y+3z= 2
                                    4x+5y+3z= 5


2)                                  x + y =  2
                                    x- y- z= -5
                                   x +3y +z= 9

please help and thanks in advance....
ASAP

astarmathsandphysics:
here

abczyx:
THANKS alot!!!!!

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