Final answer:
The 4 steps to solving a system of equations using substitution are: identifying knowns and unknowns, solving one equation for the unknown variable, substituting the value in the other equation(s), and checking the solution.
Step-by-step explanation:
- Identify the knowns and the unknown in the system of equations.
- Choose one of the equations and solve it for the unknown variable.
- Substitute the value of the unknown variable in the other equation(s) and solve for the remaining variable(s).
- Check the solution by substituting the values of the variables in both equations.