SOLUTION: In 3 years, alex will be 3 times as old as his sister precy. a year ago, alex was 7 times as old as precy. how old are they now?

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Question 1098691: In 3 years, alex will be 3 times as old as his sister precy. a year ago, alex was 7 times as old as precy. how old are they now?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
In three years,
A%2B3=3%28P%2B3%29
A%2B3=3P%2B9
1.A-3P=6
A year ago,
A-1=7%28P-1%29
A-1=7P-7
2.A-7P=-6
Subtracting eq. 2 from eq. 1,
A-3P-A%2B7P=6%2B6
4P=12
Solve for P then use either equation to solve for A.