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Solving systems of linear equations by substitution

Question:

Solving Systems of Linear Equations by Substitution

1. 4x+y=12 (1)
x-y=8(2)

2. 4x+y=12
x-y=8
5x/5 = 20/5

3. X=4

4. 4(4) =y - 12
16+y = 12
Y =4

I think this would be an example of elimination method for solving a system of equations however I am unsure how it would transfer to substitution method thus I am needing assistance. I am needing this to be illustrated if you will in substitution but am unclear on the method and how it is done so am looking for assistance.

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