SOLUTION: Solve the system by substitution. x + y = 12 y = 2x

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Question 63441This question is from textbook
: Solve the system by substitution.
x + y = 12
y = 2x
 This question is from textbook

Answer by rchill(405) About Me  (Show Source):
You can put this solution on YOUR website!
substitute 2x for y in the first equation and you get 3x=12 or x=4. That means that y=8.