SOLUTION: Solve the system by substitution.
x + y = 12
y = 2x
Algebra.Com
Question 110798: Solve the system by substitution.
x + y = 12
y = 2x
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given system
Plug in into the first equation. In other words, replace each with . Notice we've eliminated the variables. So we now have a simple equation with one unknown.
Combine like terms on the left side
Divide both sides by 3 to isolate x
Now that we know that , we can plug this into to find
Substitute for each
Simplify
So our answer is and
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