Question

Use the substitution method to solve the following system of equations.

x + 2y – z = 7
4x – y + 3z = –2
2x + 2y – z = 9 Use the substitution method to solve the following system of equations.

x + 2y – z = 7
4x – y + 3z = –2
2x + 2y – z = 9 @Mathematics

Answer 1

You have to isolate one of the variables, (I'd start by x in the very first equation) and substitute it in the other equations, then do the same stuff, untill you get a result.
I'll be glad to help if you are stuck somewhere.