SOLUTION: What is the value of x if y=3x and 4x+2y=30?

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Question 218412: What is the value of x if y=3x and 4x+2y=30?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
4x+2y=30
4x+2(3x)=30
4x+6x=30
10x=30
x=3