SOLUTION: how could i make a system of equations (2) for this problem: sue is 4 years younger than sally. in 3 years sally will be twice as old as sue. how old are they now?

Question 62355: how could i make a system of equations (2) for this problem: sue is 4 years younger than sally. in 3 years sally will be twice as old as sue. how old are they now?
Answer by joyofmath(189) (Show Source): You can put this solution on YOUR website!
how could i make a system of equations (2) for this problem: sue is 4 years younger than sally. in 3 years sally will be twice as old as sue. how old are they now?
Let S = Sue's Age
Let A = Sally's Age
Then, .
Also, .
Then, .
Or, .
Or, .
Or, .
Or, .
So, Sue is 4 years younger than Sally, so Sue is one year old: .
Let's verify the answer:
If Sue is 1 year old then Sally is 5 years old. In 3 years Sue will be 4 years old and Sally will be 8 years old so, indeed, Sally will be twice as old as Sue.
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