SOLUTION: Can you please explain to me how to solve this problem x+y=4 and -3x+12 using substitution?

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Question 24211: Can you please explain to me how to solve this problem x+y=4 and -3x+12 using substitution?
Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
Did you write the whole problem correctly? It looks like you may have forgotten some of the second equation.
=)