SOLUTION: how to solve this by using substitution y=2x x+y=12

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Question 590137: how to solve this by using substitution
y=2x
x+y=12

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how to solve this by using substitution
y=2x
x+y=12
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Sub 2x for y in the 2nd equation.