SOLUTION: Erin's age is 3 times Warren's. In 4 years she will be twice as old as he will be. how old is each now?

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Question 7246: Erin's age is 3 times Warren's. In 4 years she will be twice as old as he will be. how old is each now?
Answer by ichudov(507) About Me  (Show Source):
You can put this solution on YOUR website!
Translation from English into algebrese:
Erin = 3*Warren
Erin+4 = 2*(Warren+4)
Erin-3*Warren = 0
Erin - 2*Warren = 4
Solved by pluggable solver: SOLVE linear system by SUBSTITUTION
Solve:
We'll use substitution. After moving -3*Warren to the right, we get:
1%2AErin+=+0+-+-3%2AWarren, or Erin+=+0%2F1+-+-3%2AWarren%2F1. Substitute that
into another equation:
1%2A%280%2F1+-+-3%2AWarren%2F1%29+%2B+-2%5CWarren+=+4 and simplify: So, we know that Warren=4. Since Erin+=+0%2F1+-+-3%2AWarren%2F1, Erin=12.

Answer: system%28+Erin=12%2C+Warren=4+%29.