Final answer:
The system of equations provided is incomplete and contains errors. In solving by substitution, the process involves isolating one variable, substituting into the other equations, and solving consecutively. Precise guidance requires the correct system of equations.
Step-by-step explanation:
The system of equations you've presented appears to be incomplete and possibly includes typographical errors. For a system of equations, we expect to have as many equations as there are variables, to provide a unique solution. In this case, however, the question seems to be missing some numbers or parts of the equations. Nevertheless, I will guide you through the general process of solving a system of equations by the substitution method.
To solve by substitution:
- Solve one of the equations for one variable in terms of the others.
- Substitute this expression into the other equations.
- Solve the resulting equations, which typically will be simpler.
- Continue substituting and solving until you find values for all variables.
- Back-substitute the found values into the original equations to check for correctness.
Due to the apparent errors in your question, it's advised that you double-check the equations and resubmit them for accurate assistance. If you provide the correct equations, I could give you a more precise solution to your problem.