SOLUTION: solve this equation by substitution y = 3x and x + y = 8

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Question 339688: solve this equation by substitution y = 3x and x + y = 8
Answer by Alan3354(69443) About Me  (Show Source):
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solve this equation by substitution y = 3x and x + y = 8
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x + y = 8
y = 3x
Sub for y in the 1st eqn