SOLUTION: Can someone explain the basic principles for the substituion method? I would like to know what can make it easier to understand if at all possible. Thanks!

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Question 75214This question is from textbook
: Can someone explain the basic principles for the substituion method? I would like to know what can make it easier to understand if at all possible. Thanks!
This question is from textbook

Answer by jim_thompson5910(21685) About Me  (Show Source):
You can put this solution on YOUR website!
If I have
x%2B4=8 which solves to
x=4
So the solution is x=4. Now you would substitute 4 into x (4 would take x's place since x is really a placeholder for a number) to show that it's true
highlight%284%29%2B4=8
4%2B4=8
8=8It's true and it works. The same idea applies to variables as well.