SOLUTION: What is the system and it's solution of x+4y=12 y=-x

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Question 220893: What is the system and it's solution of
x+4y=12
y=-x
Answer by rdamanik(3) About Me  (Show Source):
You can put this solution on YOUR website!
x +4(-x) =12
x - 4x =12
-3x = 12
x = -4