SOLUTION: Solve the system by addition or substitution. 3x + 6y = 0 x = 2/3

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Question 110799: Solve the system by addition or substitution.
3x + 6y = 0
x = 2/3
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

Start with the given system
3x%2B6y=0
x=2%2F3



3%282%2F3%29%2B6y=0 Plug in x=2%2F3 into the first equation. In other words, replace each x with 2. Notice we've eliminated the x variables. So we now have a simple equation with one unknown.


2%2B6y=0 Multiply


6y=0-2Subtract 6 from both sides


6y=-2 Combine like terms on the right side


y=%28-2%29%2F%286%29 Divide both sides by 6 to isolate y



y=-1%2F3 Reduce


So our answer is x=2%2F3, y=-1%2F3