SOLUTION: Luis is 16 years older than Stephanie. For the last four years, luis and Stephanie have been friends. Nine years ago,luis was 3 times as old as Stephanie.how old is Stephanie now?

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Question 997482: Luis is 16 years older than Stephanie. For the last four years, luis and Stephanie have been friends. Nine years ago,luis was 3 times as old as Stephanie.how old is Stephanie now?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
y luis
x stephanie
system%28y=x%2B16%2Cy-9=3%28x-9%29%29