SOLUTION: Jack is 3 times as old as Lacy. 9 years from now the sum of their ages will be 70 . How old are they now?

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Question 944706: Jack is 3 times as old as Lacy. 9 years from now the sum of their ages will be 70 . How old are they now?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
Jack = j
Lacy = l
j=3l
%28j%2B9%29%2B%28l%2B9%29=70
use substitution method
%283l%2Bl%29%2B9%2B9=70
add like terms
%284l%29%2B18=70
subtract 9
4l=52
divide by 4
l=13
substitute to find j
j=3%2813%29
j=39