What is the solution to the following system 4x+3y-z=-6

Solve equation [2] for the variable  y  
 

// Plug this in for variable  y  in equation [1]

// Plug this in for variable  y  in equation [3]

// Solve equation [3] for the variable  z  
 

// Plug this in for variable  z  in equation [1]

// Solve equation [1] for the variable  x  

// By now we know this much :

// Use the  x  value to solve for  z  

// Use the  x  and  z  values to solve for  y  
  y = 6(1)+3(1)-12 = -3 

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

x/3-10=8

x/3=18

x=48