Question 634643
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Hi,
 x- 3z = -5    | x = 3z- 5
Have a relationship between x and z, so...eliminating y from the other two EQs
2x- y + 2z= 16      |mulitplying 1st by 3 and subtracting it form the 2nd EQ
7x – 3y -5z =19
   x  - 11z =  -29 
 (3z- 5 - 11z = -29
         -8z = -24
           z = 3  and x = 4  and y = {{{ 2*4 + 2*3 - 16 = -2}}}