I am not sure what the question is, but heres my 2 cents.
You know what? Never mind. I don't get the question at all. In order to use substitution, you must totally isolate a variable to 1 side, and only have the variable on 1 side. Then you substitute it. Ex:
2y+4x-5z=45
2z+x-4y=54
Isolate x in the 2nd equation, as it is easier:
x=54-2z+4y
Now, substitute it:
2y+4(54-2z+4y)-5z=45
Got it? I might have done something wrong.
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To solve a system of equations, you need equations (number phrases with equal signs).
The answer depends on whether they are linear, non-linear, differential or other types of equations.
Its harder to solve the equations with grande numbers
Multiply every term in both equations by any number that is not 0 or 1, and has not been posted in our discussion already. Then solve the new system you have created using elimination or substitution method:6x + 9y = -310x - 6y = 58
No. The word "order" has various meanings in math, but I don't think this is one of them.