SOLUTION: Solve the system by substitution. x= -y + 12 3X - y= 6

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Question 616549: Solve the system by substitution.
x= -y + 12
3X - y= 6
Answer by Alan3354(69443) About Me  (Show Source):
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Solve the system by substitution.
x= -y + 12
3X - y= 6
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Sub for x in the 2nd equation.